Beliefs on sex? Well, long ago, in the Vast Celibate Plains, the vorracious Dildo beast ravaged the lands, only to have to face the great hero, Condomius...
Or maybe that was just a really weird acid trip I had. Anyway, sex to me is mostly just a biological function I do for fun. I don't really see much promise in the idea that celibacy is the preferred option, because I think that suppressing a natural impulse like sex based off of irrational doctrines doesn't really help anyone (if you're celibate by your own choice and have decent reasoning behind it, then good on you). I'm one of those Safe Sex Nazis, though, I'm not planning on having any kids soon and I'll be damn sure to avoid it. Basically, I think sex is something that should be carefully explored by an individual, and that you should never do anything you aren't comfortable with.
Most of these beliefs are things I've figured out on my own, I went to a Catholic elementary school for sex ed so their views were a little...biased (they refused to talk about the actual act of sex and instead just showed alot of diagrams of the penis and the vagina, then explained the science. I can safely say that was one of the few times at this elementary school that they actually used science correctly). My high school sex ed wasn't much better, my teacher was one of those asshole gym teachers who picks on everybody, he used to use people he didn't like in gay marriage examples in class. So out of those 'fun' experiences I'd say the best way to learn is to figure out things in your own way, take your time and all that.