The only way this fetish becomes truly relevant is if you create a virus that kills straight people and infect every body of water. I don't care if some people like it or not, it's simply not very appealing to the general population, especially the pregnant part. Hell, pregnancy by itself will make you look like a weirdo if you openly talk about it, something not even foot fetish would achieve most of the time, and that's what I've experienced personally since my brother found out about my interest in feet.
Anyway, this is all irrelevant, since my point was about how simply having a vagina is not enough to attract people sexually most of the time. Buff women could also be used as an example, since they can look very masculine and that's enough to repel men (and lesbians, I guess). Tomboys can be cute, though, if they're not using PEDs.