Forethought in the heat of the moment is pretty hard.

If it wasn't, I'm sure people would have a lot fewer kids.

After 10 years of perfect condom use, you have more than a 25% chance of getting pregnant.

I'm going to refrain from doing the math backwards to find out how often you have sex.

You are confusing how hard it is to push a rock back up a hill with how hard it is to push the rock down a hill.