It depends on how Horny you are and it probably peaks at like 14 or something and after that you can wank less. But you don't want your body to be given the impression that your having sex with women if you aren't (Maybe that's why you say it makes you lazy, you reproduced your work is done)
and theres complicated hormones involved as well. Since men are horny around the clock rather than being hornier at certain points in a menstrual cycle, they should wank sometimes but keep it to a minimum.