A (girl) friend talks to you about sex
I was talking to a girl friend of mine and she asked me if I was comfortable talking about sex and I said I was so we started talking about everything. We asked each other if we had hair down there, what we liked, our fantasies, described our sexual experiences somewhat explicitly, if we masturbated and some weird stuff like, I asked her if it felt good when her boobs were grabbed and she asked me if I liked my nipples being touched (I'm a guy) if we would insert stuff into our anus and so on...