Tiger Woods had 7 or 8 affairs while married.

Now that it's come to light Tiger Woods was cheating on his wife, I ask people if they're surprised. I get mainly two responses:

1) "Yes! I'm very disappointed. How could he do that to his wife? He's going to lose his sponsors."

2) "No big deal. He's a normal billionaire. They all cheat on their wives."

On the one hand, Tiger made a promise to be faithful to his wife. Breaking this promise, hurting his family and jeopardizing his career seems spectacularly dumb.

On the other hand, Tiger is a male human being whose genes have programmed him to want sex with as many beautiful women as possible. Even if his willpower is 99% - and surely as a professional athlete he's been propositioned over 100 times - the one time he makes a mistake brands him forever as a "cheater". (Of course he made 7 or 8 mistakes.)

Doesn't sound fair.

This situation brings up the fascinating question: is monogamy a natural state between two human beings? I don't know.

What I do know is that many male rodents deposit a plug of mucus inside the female's reproductive tract after they ejaculate. The mucus plug stops other male sperm from going into the female's vagina.

But the rat penis has a little suction cup at the tip. It sucks out the plug like a toilet plunger. Some females reach inside their vagina and pull out the plug with their claws. Then they eat the plug.