What if you were the only girl in the entire world? (Yeah, this is the male ver)
I like the premise, but I will admit it makes less sense than the female version. At least with a guy in a world with only women, he can pump out quite a few loads per day. In a world filled with dudes, and a single girl, you've got 9 months for a pregnancy, plus a few months for physical recovery, so bare minimum ...