I love sex and I love talking about it. It depends on who I'm talking to, of course (evangelical Christians, for example, seem profoundly unable to talk about sex... so I avoid the subject with them), but if the other person is comfortable with the topic and the whole situation isn't creepy in any way, I'll talk for hours about it with my girlfriends. Sometimes even with guy friends, too, if they're safe to talk to.
Mind you, I WAS very conservative for my teen/college years, and believed in saving sex for marriage... but thank god, I wasn't raised religious. So eventually I went back to my pagan roots (as a little girl, I was pretty friggin' dirty, just for fun!), once I hit my mid-20s, and have been enjoying myself ever since. I feel kind of bad for most of my old religous friends, because I honestly think they are too afraid/ashamed to talk about sex frankly with anyone. I bet a majority of them have never had an orgasm... sad.
Hell, even my mom and I (and dad and I too, though not as much) talk about sex, because she's pretty down-to-earth and funny when it comes to sex.
And I'm very glad for that, with my parents. I think they wanted me to wait until marriage, but since I waited until I was at least mature enough to deal with consequences (24), they seem to have respected that. My mom freaked out at first when she heard I lost my virginity, but she has since calmed down and we talk about sex frankly.
My boyfriend and I have pretty much only been with each other, but we have a very communicative relationship when it comes to sex, and we tell each other everything. We are open-minded about trying new things (though we are exclusive with each other), and we don't mind talking frankly with our other couple friends about sex (if they are not shy).
So, yeah, it all comes down to the person I'm talking to. If they're open and not too shy, or they're at least interested in getting some practical, safe information, I'm all about it. Sometimes I even wish I could work for a female-owned sex shop like Good Vibrations, just because it's so cool and it's great to educate others who might be more afraid/ashamed but want to learn more!