Why do women and men have unprotected sex, then wonder if they are pregnant or not, or have std's or not?

Because A. they are not very smart...well of course unless they wanted to get pregnant, but nobody wants a std and B. Its like a in the moment kind of thing and then after your like omg what did i do. I guess most people let the "sex" take over instead of the brain. I'm sure during that day they weren't driving around in there car saying to there self .... HEY I'm gonna have unprotected sex tonight and later wonder why i'm pregnant or have a std. Plus one huuuuuuuge factor is called BEING DRUNK!

You are the most Intelligent female, (if you are), that I have ever seen on here.

But, there is a reason. Mother nature is all powerful and has built into each human being a "blocking mechanism". As your mind turns to the thought of intercourse, all thoughts of negativism are suppressed, such as embarrassment, shame, fear, std, pregnancy, etc. and all the common sense issues you would normally be thinking of.

Unfortunately, after the act, the mind comes back to it's senses. "Oh my God! What did I do!

Y'see, mother nature and societies rules are in constant conflict.

Good point. If only people would wake up and smell the coffee like you have. Seriously. However, the thing is, people are selfish. They naturally wanna marry and reproduce without regard as to how it impacts their future lives or even the rest of the world.