Not weird at all. If you ever want to have kids it would be nice to know. Also, when you get a girlfriend it would also be nice to know if something happens (heck, my youngest son was conceived while I was using a condom and my wife was using a diaphragm).

As far as being worthless if your sperm count is a little low, I would offer that it doesn't make you any less of a man. Heck, when I got my vasectomy (my sperm count is 0) it was like taking the dog off the rope since my wife and I didn't have to take precautions any more. How you treat others is what helps define you as a man, not your ability to over-procreate.