Sisters Liz and Nat enjoy an above-ground backyard pool, inviting nerdy next-door neighbor Dan to join them. Nat is older, gorgeous, and the high school social queen, while Liz is heavy and feels overlooked. Dan, attracted to both sisters, thinks he has no chance with Nat, and soon he's partnered with Liz. Dan and Liz's deep intimacy is encouraged by Dan's single (and swinging) mother and the sisters' father. A simple teen romance explodes into lusty combinations.
A widower raising his teenaged daughter takes her on a special trip to the Pacific Northwest for her grade school graduation present. Their vacation is thwarted though when they are captured by two criminals fleeing from a bank holdup in Spokane, Washington. The criminals terrorize them and force her father to do the unthinkable!
When Patricia and Barbara's boyfriends bail on helping them practice for an upcomming wet t-shirt contest, the two college juniors turn to Patricia's dad for advice. Things get out of hand durning the practice leading to things none of the three would have ever expected.