A couple years ago my friend Ernesto and I were up late watching some kind of educational-cable-channel and their special titled “SEX”. The only thing I remember learning from that program is that men produce three types of sperm. Did you know that? I find it very cool.
There is a sperm that is a blocker (I don’t remember the scientifc names). The blocker swims up to the egg wraps itself around the egg and only lets in sperm from the same man that it came from.
Another sperm is the attacker. The attacker fights off sperm from other men. What is really amazing is that when a man has been away from his partner or believes his partner to be cheating he seems to produce more attacker sperm.
The third sperm is the fertilizing sperm, whose only job is to find that egg and get in. You can read more about sperm here.