>>42546725
Many people are in fact sexually attracted to mares, however sexual attraction in itself is more complicated than just "unf mare plap".
Mares being fuckable does play a big part as anons want to spend more time with mares because they want to have FOALMAKING SEX with them, but that doesn't cancel out anything that doesn't involve touching marepussy while they touch your dick, many would love to grew grapes with Bewweh, for example. That's just how adult human attraction to the opposite gender typically works, especially considering that this place is full of introverts who don't want a lot of personal interaction with the same gender (stallions in Equestria), they instead want lots of interactions with a cute mare they love. But I'm judging by myself.
And then there's people like the schizo above who think mareposting is some part of epic rivalry, even though saying "foalmaking sex with mare" doesn't contradict getting TF'd, unless you imagine yourself also becoming infertile lmao.
tl;dr: introversion, it drives an anon to not to feel much emotions towards stallions aside from "he's cool I guess" and thus to not think about interacting with them a lot, but mares, as beautiful and kind females, incite a wide spectrum of things someone would like to do with, sex being one but not the only.
So, what about foals. Adult people, especially men typically want to have their own children rather than spending time with children of other people/ponies, but being a nanny who brushes fillies' manes sounds nice and comfy.