Since we're all talking about extreme age difference with (sexual) partners, I have one, but please folks do not freak out the moment I give you the ages... Okay, here we go:
I "did it" with a 12 years old girl when I was 19 years old myself. It was her first time, but not mine, I already had plenty of experience.
I never openly talked about this because I feel kind of bad about it in retrospect, but she never regretted it. I have to say that she was REALLY mature for her age. When I first met her I thought she was 16-18 years old. Who would have thought she was 12? I guess her rough childhood made her grow up faster than the other girls around her.
Funny enough I saw her again a few months ago. I'm 24 years old now, and she's 18 years old right now. We talked about lots of things, how we are doing now, and what or future plans are. We also talked about the past, and about us. She said it's 5 years later now, and she still doesn't regret a thing. She thinks I've been real nice and real gentle with her, and that's more than she can say about the boys she dated after me.
She turned out to be a very fine woman. Yes, she's just 18, but if you'd see her you would agree that she is a woman now, not a child. She's in a relationship with a nice 23 years old guy now. They're living together in a nice little apartment and she's pregnant of his child. I really wish the both of them the best of luck.
But yeah, even though she says she doesn't regret anything (and I'm really glad to hear that), I still feel a little bad about it. If I could turn back the time 5 years, I really wouldn't gave gotten romantically involved with that girl, as nice and sweet as she might have been. It just... doesn't feel right. I mean, sure, it felt right at the time, but looking back at it... it just doesn't feel right you know.