To Sex or not to Sex.

Today I got to think about all of the sex rules.

One one hand everybody knows that sex is fun, well almost everybody... And on the other, we are not supposed to have to much of it, we are supposed to go on several dates if we don't want to seem cheap and easy. And we are not supposed to be talking about it.

Couple of days ago I was in a bar and a guy came to me, asking if I wanted to have a drink, the moment I saw him, I knew I will not be interested in having an intercourse, and so I told him:
 - You can, but I won't have sex with you.
Everyone around me, including a guy were shocked and offended. But why? Any woman or a man, being in a bar, can tell if they are interested in each-other within first 5 minutes, there rest is just foreplay. So isn't it more honest to just be clear about it?

I'll never believe that people come and get drunk in bars hoping to find their true love, we all come to have fun, drink and flirt. And in one out of a hundred times you'll see someone you are actually interested in (I'm not talking about bimbos and money bags). So why lie? Why can't we just do what we want to do and say what we wan't to say?

Why is it so hard for us to be honest? Even with ourselves?