Well...my other questions still stand.

I ask 'cause I've read two things with similar premise before.
The manga I read had the female population die out due to a virus, which also killed any conceived female as well as the mother after a time, I think...? After 20-40 years, the youngest women were in their 40s. To deal with the want/desire for women, if not for reproduction then to just fill the void of one gender, they chose men to undergo sex changes...otherwise, homosexuality became common place.
Some piece of literature back in the day had the male population die out, and the female population had to use science to keep the population going...they became entirely homosexual since it was centuries since men even existed.

Of course, this thing has artificial males, so the void had been filled comfortably enough, I think...?
@_@