When it comes to reproduction, men are more potent, well actually ever potent, compared to women. There is about a one-week time window per month in which a woman can get pregnant. On the other hand, your typical man (assuming everything is working okay) is always ready to give forth offspring(s) every day for 365 days per year. They are always ready to go, ready for action.
So then, why aren’t there any male contraceptive, while female contraceptives options are in their tens? The answer is pretty simple; compared to women, men are just wimps.
Now, I do not mean any disrespect to my brothers and fathers out there. It just that the stalling (which will lead to the eventual shutdown) of a recent promising male contraceptive research proves men cannot handle what women have been handling for years. Simply put, women are stronger than men; their capacity to endure pain make men look like wimps.