Because sex is very personal, and, like anything else that involves personal things, sex is also a very quiet and tabbo kind of... thing.

Of course it's wonderfula dn all that stuff, but it just isn't anything to talk too much about all the time, because sexual fantasies/activities between two people are private things. At least, in my life they are.

Also though, sex is very delicate work, because it affects all emotions, and can hurt people if it is used incorrectly. Masturbation, adultery, and generally sleeping around can cause peoblems for a person. So, since we know what is safe and right, there isn't much to talk about there. When we do things that are a little shady, sexually, then the privateness of it is also more of a secret that requires being kept from much talk. Certainly nobody wants to hear about somebody masturbating all the time, that's not cool, or sleeping around, because STDs aren't cool, or cheating, because striking your wonderful lovers to the heart with your cruel betrayal is also uncool, respectively.

And so it isn't really a decent topic of discussion. I also find it a rather boring topic of discussion, UNLESS we're talking about all the bad things which, of course, nobody wants to talk about because it's bad.

Which is why I get my non-taboo other-people's-sex entertainment from movies, usually comedy. (Romance novels don't do anything for me. I think they're written like crap)