OK Ladies!!! You've been holding out on us all these years!!!!

[Hugh_Lebowski]

2. They effectively can in most cases unless the guy's a total asshole

By controlling ejaculation happening/not happening, whether or not there's a condom in use ... and if not, which hole it went into, or where it landed.

Obviously not the AMOUNT, but not only did she not say 'amount', that measurement is fairly immaterial. It doesn't take much to cause pregnancy. Learned that in Sex Ed.