I'm in a bit of a pickle

A friend of mine keeps arguing that men have a predetermined sperm count for their entire life (the same way females have a limited number of eggs -- note that this is not about decreased sperm count which occurs at older age). Could anyone fix me up with some academic references that could settle this once and for all?

>>1
Males and females are completely different. 

Men produce sperm regularly and women start with a fixed number of eggs on a monthly cycle. Women goes through a biological change ie Menopause whereas men do not and can continue having children provided the sperm motility is high enough.  Even if the sperm is not able to impregnate naturally IVF is still possible.  Therefore the theory men have a fixed number of sperm is incorrect, ie Men continue to produce sperm constantly if this wasn't the case there would be very few children due to the constant fapping men do.