I would imagine, given the average age/ social ranking on here, that many people will say something like "I'm a virgin", or "i haven't had a girlfriend/boyfriend" but then say that they're not interested or something. (And yes, I admit that I am one of these people)
Face it. On some level, we all want it. It's just a basic human instinct really.
It may even be a subconscious thing or you just don't think about it normally.
I would imagine that some of the social elements of sex could be both beneficial and harmful in different situations, so even though we might all want it, sex isn't something to just "do" if you get the chance.
On the other hand, people that are better than some of us with the opposite gender (or the same gender) will probably say that they enjoy it. I would be surprised to see anyone who doesn't.
Feel free to surprise me though.