Real question: Why do women have unprotected sec if they KNOW it leads to pregnancy??

I see posts like that all the time on here. They did nothing to prevent it and then get upset at the fact that they might be pregnant. There is being uneducated then there is this. This is THE MOST basic thing of sex. Also if someone is uneducated about sex why you they do it?? If you are uneducated by all means ask questions on here, but ask them BEFORE you engage in sexual activity!!