How to recover lost sperms?

Gone forever: Just like the lost hairs that fall from the scalp each day, and like the lost skin cells that flake off of the entire body each day, the many sperm that come out of the penis each day are also lost and gone forever. There is no way to recover them, but what would a guy do if he saved them? The two exceptions are: freezing them in a sperm bank or starting a pregnancy (1 sperm "becomes" a baby).