Of course you can create it basically anywhere. But if you’re going to allow posting of pictures of women in bikinis, your community will be mainly used to masturbate, that much is guaranteed. So if that is the case, it makes complete sense to put it on lemmynsfw.com.

I’m not sure how many are actually interested directly in bikinis. I.e. if there was no woman attached to them, would people actually like and comment on pictures of bikinis, or start discussion threads about topics related to bikinis? I mean sure, there are probably some people, but I’m also pretty sure they’re vastly outnumbered by people interested in bikinis because a woman is clothed by them.