My best friend, Jen, can’t get pregnant due to her husband’s low sperm count. They can’t afford the huge in vitro expense and refuse to use a sperm bank. After ruling out adoption, they had one option left. She wanted a donor she knew and who had great genes, so she asked my husband, Al, to donate and let her husband use a turkey baster to put his seed directly in her womb.

As if that wasn’t wrought with enough complications, we were all astronauts on a short list to go to Mars. After some training, as we all stepped out of the communal shower and away from the others, Jen begged us and insisted we’d have no parental obligation, but she wanted the child to know the truth — that he had two dads. If Al agreed, she’d drop out of her dream Mars mission.

Al didn’t like the idea of filling a cup with his swimmers. After some pondering, he agreed to donate as long as he got to do it the natural way, daily until she was pregnant. Jen’s husband, Jim, said “No way is someone else going to fuck my wife for forty or sixty or ninety days while I just...”

“Just what, honey? Just watch? Are you going to deny my dream over a simple physical act, or acts? Many couple swing with no intention of creating life. This doesn’t have to be a swap — hard or soft. It’s a temporary chore.” Her face swelled and a tear raced down one reddened cheek.

I intervened, “We don’t have to decide this minute. The mission is still six months away and we all shower together in the communal crew showers, so we can’t be too shy about being naked together.” That seemed obvious as we watched each other towel dry with heightened interest.

Jim said, “It’s not the nudity that bothers me, it’s the intimacy of passionate kissing and Al slipping his cock where only I should go. Wouldn’t it bother you, Al, if I docked my sub deep in Abby’s port?”

“Actually, Jim, it wouldn’t. We’ve been to swing clubs and have an open marriage. As long as we know who, and they are disease free, we can and have fucked strangers. We are secure in our love and treat sex with others as if we are ... dancing — sometimes naked, but still just dancing. Sex is physics; love is chemistry. We enjoy the physics.”

As we dressed, I added, “Why don’t we have a BBQ by our pool to discuss this further? This Saturday, noon, OK?” Without giving them a moment to disagree, I grabbed Al’s hand and whisked him out of the NASA training center.

By 1:00 p.m., the burgers, dogs, and beans were done. Al put a London Broil on the grill and we sat to eat, still avoiding the main topic. Jen and I wore shorts and a tank top, the men stripped to shorts. We had tacitly agreed to avoid the pool by not mentioning it. Chilled wine went well with lunch and helped loosen our tongues for the big conversation. Subtle glances and frequent blushes broadcast our thoughts. Jen was still on eggshells; Jim stiffly sidetracked any attempt to bring up talk of donors.

Finished with her meal, Jen drained her wine glass, and left it behind. She wobbled a bit around the grill. I got up to take her paper plate and bumped into her, sending her flailing into the pool. She screamed until she was under water, then bobbed up pointing at me. “You did that on purpose. Didn’t you?” then, she laughed. “The water is quite cooling, not like the giant NASA pool when we are in our space suits and can’t feel it. Come on in, Abby.”

Laughing, “I would, but I don’t have a swim suit out here. You wouldn’t want me to skinny dip, would you?” Jim walked to the edge of the pool and leaned in to help his wife out. So, I pushed him. He made such a splash. We all cracked up at our wet guests. Al and I carefully crouched and offered to pull them out. What a mistake that was. They gripped our hands, put their feet against the sidewall and yanked us unto the pool with them. They laughed loudest.

When I tried swimming, I felt my clothes dragging me down. After dipping under, I came up with my top and bra in hand. I tossed them out of the pool and ensured my tits were visible. “That’s better. Wait.” I dipped under again for several seconds, then came up waving my shorts and panties around before tossing them aside. “This is so much better. Come on, guys, strip and cast away your baggage.” Al, of course, quickly stripped and tossed aside his shorts and boxers next.

We swam to our guests and threatened to strip them if they didn’t do it quickly. They dared each other with their stares, then Jim went under and came up naked. Jen hesitated, so I leaned her back and pulled her top off. Al went under and dropped her shorts. Jim’s mouth and eyes went wide as I unhooked her bra and tossed it aside. I held her gorgeous tits with envy. As I fondled her nipples for the first time, Al went under again and came up waving her panties. We were finally all naked outside of work. Half hidden by the water, they loosened up and played and groped us.

Maybe a half hour later, we crawled out of the pool. For the first time, we openly studied each other. Al commented, “You know, Jim, every time we showered together at work, I had to shut down my admiration for Jen’s body or my cock would give me away.” He stood up. “Now my stiff cock and I salute your beauty, Jen.” She stared at Al’s stiffness and giggled. After standing gingerly, she held her arms out and let us stare at her heavy tits, stiffening nipples, and blushed.

Her eyes glistened, her perfect smile enchanted. She crossed her muscular legs, then moved one apart to show off her hairy pubes and hairless, swelling, and glistening vulva. Beautiful. As she turned slowly, she breathed deeply, making her enticing tits rise and fall gently, and showed us her tight ass. Every curve bent perfectly. We never realized what a goddess she was. I became embarrassed comparing any body part to hers. Al’s cock surged several times. I watched the pride swell in Jim’s athletic body and enjoyed watching his thick, bouncing cock react to his wife’s exposures.

Staring with growing lust, “I’ll ... uh, go get us a towel.” I quickly decided to make that true. Jim helped me scoop up the wet clothes. I was intensely aware of his stares up my ass and pussy every time I bent over — so I bent a lot. Lightly scratching my ass allowed me to pull a cheek out and fully expose my wrinkled rosebud to Jim. He barely suppressed a moan.

After putting the clothes in the dryer, I came back out with one towel. The men were smiling and teasing Jen, prick-close and slapping her thighs and ass with them. “One clean one was all I could find. We’ll uh ... share it. Come, Jim; I’ll do you first.” Was that too obvious? My heart raced as I wondered if he would ignore my innuendo.

“Whoa, Abby. Your husband won’t mind?” I guess he did catch my double entendre. I dried his hair and pulled back the towel when he tried to dry himself.

“No, Jim. I said I’d do you.” I winked, and he released the towel. I wiped down his chest, back, arms, and legs as I obviously avoided his cock. He spread his legs and made his cock surge into my hand. I stared at it; admired its circumcised beauty and wondered how it would feel inside me. I gasped when he waved it at me, challenged me. When I draped the towel over it and began to “dry” it, he moaned. I held and dried his balls and cock. As if in a dream state, I bent and kissed his cock. He and Jen gasped.

“You’re next hon.” I pretended I didn’t just kiss a friend’s stiff cock. Al got the same treatment all over, except for a longer kiss on his uncut cock as he fondled my tits and pussy in front of our friends.

“Next,” I called out to Jen. Her nipples went from crinkled to stiff and tall when she watched me lick Al’s cock. Her eyes said she wanted to take him, now. After a quick hair wipe, I rubbed her back and ass, feeling the deep muscles in her glutes, then down her legs before coming up her front legs and finally her wet pussy. Even after drying her pubes and lips, her swelling labia remained wet. She toweled me as I tended to her labia. We spent a long time rubbing our vulvas. My fingers rubbed her lips apart, circled her clit, and “accidently” slipped inside her.

She gasped, then moaned. Our husbands rubbed their cocks as they watched me frig Jen. After wiping her tits, I dropped the towel and licked her tall nipples. Al whispered, “Have you ever seen a more perfect pair of nipples? I love how they morph from smooth to hard, twisted, tall, and dense fonts — perfection. Your wife’s are intense too.” Though I heard him, I kept sucking Jen’s tasty tits. As she began to moan, I bit harder. She clamped down on my fingers and soaked them with her wetness. We kissed, gently, then passionately. As she began to finger me, I bit her nipple harder and she shrieked, then shuddered in orgasm. Her knees gave out and both men rushed to catch her and carry her to a lounger.

Jim said, “As far as I know, she’s never been with a woman like that. Now we know she is responsive to Abby. Should we check if she responds like that to you, Al?” I licked one Jen-covered finger and wiped the other across her lips. She licked them and seemed pleased with their flavor.

Al said, “What we just saw, from Abby’s wiping us down sexually to fingering Jen and making her cum, is the essence of a warm swap — though you haven’t engaged with Abby yet. We didn’t plan this, so we should decide if we want to continue warm or maybe go to HOT. What do you guys say?”

Jen was all smiles and began gently rubbing her clit as we watched. Her vote was clear. Jim was also clear. “Umm, I’m not sure I’m ready to watch Al make Jen cum even with his fingers or mouth. Hot swapping includes fucking, I assume. For sure, I’m not ready for that. Jen seems intent on cumming for us and I’m all for that now. Then we’ll call it a day since we have more to discuss.”

Jen was the center of all our attention as she finger fucked herself and made the most delicious sounds with her wet pussy and her moans. As she spread her legs, the men pumped their cocks — even the reluctant Jim. I stood between them, flesh on flesh and fingered myself as we watched Jen perform. As I pulled on my nipples, I wondered how Jen would look and sound in space in micro Gs, performing for us like this. She shuddered and came too quickly. Before any of us could cum, she got up and squeezed both cocks, then slowly went for her dried clothes.

As our friends dressed, then walked to the door, I asked, “Why don’t we set a dinner date for us just to further discuss this? How about this Friday evening? Dress for a cocktail party. See you at six.” They waved in answer. Was that a “yes?”

After a week of awkwardly avoiding each other, the following Friday, Jen and Jim arrived at 6:00 p.m. sharp. Jen wore a light brown halter wraparound top and a knee-length Royal blue skirt with a slit up to her hip — or was that a wraparound too? We’ll find out soon enough; I bet. Jim was in brown slacks and navy v-neck. Al was all in black. My skirt was mid-calf and yellow. My top was most daring. It was a Royal blue, single strap diagonally cut across my unsupported tit. Jim whistled and ran his finger along the diagonal border with pressure down leaving the edge of my nipple exposed. I left it like that.

Jen said, “Sorry about the gracelessness all week. Jim has been embarrassed about our intimacy at your BBQ. Yet we have made love more fiercely than we had in the last five years. Thanks for that. I went to the director this week to say I may have to drop out of the Mars mission. I explained why and he said he’d get back to me. What is there to think about? I don’t want to wait another five years to get pregnant, so I’m guessing I’m out.”

“You’re not out until he says you’re out. He must have something in mind or he would have told you straight away,” I said. “Let’s sit and drink.” We discussed the latest changes to the mission. Despite Jen’s sorrow, we imagined what space sex would be like.

NASA had some early experiments on the Space Shuttle from fully clothed simulations — which were an unrestrained disaster with spouses bouncing off each other and against walls. They tried double sleeping bags — that sort of worked, but gave no experimental details. Finally, they came up with an MRB, Marital Restraint Belt. That’s a wide belt with elastic ends so the couple could, umm, couple yet stay close together.

We sat on one sofa with Al and Jen in the center. Two more drinks opened the door to chat about our BBQ. Jim said, “Being naked with the whole crew is an exercise in restraint. All those fit and beautiful women make my mind wander and my dick stiff if I’m not careful. You know, Al. At the BBQ, we had no restraints. Seeing my wife naked and teasing you both made me salute and stand at full attention. Knowing that she was ready and willing to have sex with both of you conflicted with my conservative upbringing. I’m struggling with the notion.”