Not a few early experiences, dozens of them. Alas, I'm not so young anymore... What got me rethinking about p4p after giving it up is this: (sorry if it's a bit long-winded)
My current situation is that I've been seeing a girl I think I like for about 2 months now. She comes to my place once a week to have dinner with me and watch movies (she's massively into pre-70's European cinema and so am I, among other things). Sometimes we go out too and she takes lots of pictures of me and tells me I'm so handsome. So I dutifully take lots of pictures of her and tell her she's very pretty (I think she's rather good-looking so I'm not really lying about it). It's all very cute and a bit mushy and painfully naive but there seems to be some real sentiments behind that.
We cuddle and hold hands sometimes but each time I've tried to kiss her she turns me away, not aggressively or anything, she just says she's not ready. It feels exactly like being teenagers except that she's 25 and I'm way older than that. When I walk her back to the station we sometimes talk about it and I try to keep things lighthearted and not be pushy or anything and she says she doesn't really know what kind of relationship she wants with me but that anyway she needs time. I'm pretty sure now that it means it's never going to happen and at first I was disappointed but gradually, almost as a defense mechanism, I started desexualising her in my mind.
The irony of it is that of the 20 to 30 girls I've had sex with in my life, none of them felt as much like we had a girlfriend-boyfriend relationship. I think she fits into a pattern of girls who are either virgins or nearly or completely asexual and that I have attracted these past few years, I suppose because they see me as non-threatening. In her case she has had at least 3 boyfriends in the past but she told me herself that she only feels the need to have sex very occasionally. The difference with the other girls is that we actually have lots of things to talk about and the relationship never feels forced and I would probably keep seeing her even if I had the absolute certitude that nothing would ever happen.
So it got me thinking that maybe if I could devise a way to somehow maintain this asexual relationship (as long as she does not meet a guy she likes better than me) and complement it with a mix of p4p and occasional one-night stands (though they don't come easily to me, at least not anymore), maybe I could be on to something.
At first I saw it as a substitute for what I cannot get but now I'm also wondering if keeping things separate is not a good way to keep them fresh. Like sex would almost be incongruous in our relationship. It's all very theoretical of course. I don't know if anyone has actually experienced a similar situation.