Everyone who is concerned about sperm count should watch this documentary by CBC:
LaP, on 05 February 2013 - 02:31, said:
A male body needs testosterone to produce sperm.
Testosterone is derived from cholesterol. The primary source for cholesterol is meat/fish.
In order for the body to convert cholesterol to testosterone, our muscles need to be working - we must be walking, running, jumping - doing all sorts of physical activities to stay healthy.
Accordingly, seating on a couch in front of a TV gives zero work to our muscles => testosterone isn't produced => sperm count is lowered.
DocM, on 05 February 2013 - 08:25, said:
My bet: overheating.
The testicles have to be kept at a lower than body temperature for sperm development to progress normally, which is why men have a scrotum instead of internalizing them.
You are right. Wearing tight jeans is another hazard for the males because of the testicular overheating.