Why do unmarried couples risk a pregnancy instead of using birth control when available ?

I wonder that all the time. Condoms are so cheap and widely available that there's no excuse for not using at least that.

they get caught up in the heat of the moment and go in unprotected

They get caught up in the passion of the moment and didn't intend to go that far. Or don't know any better. Or they don't believe in marriage.

Schools fail to teach basic human reproductive biology from young ages. Parents are even more silent on teaching their kids about sex.

That’s what I ask myself every time I read questions in this forum. Literally people have sex without prevent pregnancies and then come here crying because they got pregnant

people dont think with the right head ... all it is ..