How common do you think it is?
A guy I knew in his twenties raped me the first time when I was 14 and virgin. Of course I didn't like it then, but he kept coming back and after I accepted it because there was little else I could do, I started to like him and the sex. I didn't want to, it just happened. Worse even, after a while we were having casual sex. Not like I just let it happen, I was willing and active.
I'm very well aware that what he did is unacceptable, and still the thought excites me that he took my virginity without my consent and it will always be his. I wouldn't want to erase the memory.
I think it made a big difference that we somewhat knew each other and that he wasn't rough or violent. He had this attitude and look in his eyes that said he was going to fuck me no matter what, but without wanting to hurt me. Every time before he penetrated me we made out first. He wanted it like that. Kissing, touching, undressing. He took his time to at least make me feel more comfortable.
I really wonder how often this happens with other girls. Rape is assumed to be very common, with a large percentage that is never reported. I didn't report him either and never told anyone irl about it.