@TheDarkKnightYeah, I did it much sooner (college) but discovering you've taken someone's virginity by accident (i.e. not knowing what was at stake), is fairly haunting. If you know what you're getting into (no pun intended), you seek to minimize the damage. Worse, I was friends with the girl, who was trying to determine, whether she was hetero or gay.
She found out, but burdened by guilt, I was unable to maintain the friendship. She eventually found someone else (again, we were never a couple, as I was merely a willing patsy). I also liked her new girlfriend but again, have no clue how much she was told (relevant details), as it wasn't really something you can easily discuss.
I have used the emotional response of that in several stories, making my characters more aware of the potential repercussions and actively weighing the odds, yet I could never write about the actual experience. As how do you write how blind, stupid, ignorant or foolish you are, nor describing the overwhelming guild.
Again, if she'd merely said "Hold on, before we start β¦" I'd have been fine. But that's my cross the bear, no one else's. They made their choices, and I've bourn the responsibilities of mine. (Yet another reason not to sleep with friends you have no real desire for.) Being a patsy doesn't really held that utter sense of helplessness.
For her, it was a few longish moments of pain, but I've also considered each time I've started a new relationship. But then, I've always been a classic serial monogamist. I don't mind informed consent (allowing one's partner to sleep with someone else) but I'm not the one to seek a sexual partner like that (aside from sex clubs, where everyone is well aware of WTF they're doing).
Now that's fodder for some great stories, but all of my sex scenes involve some form of weighing the potential costs. Though, like my one-time partner, most are more than willing to completely ignore them, while I felt like I was hoodwinked rather than merely blindsided. (P.S. She hated the entire experience, which made her decision much easier.)
And yes, she did look much like you'd expect, very stereotypically a bull-dyke lesbian.