A friend of mine gets into feet, but I think feet are kinda gross, idk. Maybe it's just me. I know some people can go crazy for feet. But there's even weirder/more gross fetishes out there.
Yeah, sounds like the dude might be a furry. I went to high school with a dude who was a furry, and he made no attempt to hide it either. Lived a few houses down from me actually, and was a pretty chill dude. Never understood why people are into that, but to each their own. It's not for me, and it's cringey as hell, but if they aren't hurting anyone, I don't really care.
One of my past girlfriends had a thing about having sex in public, but I was never able to go through with it. We tried a few times, but my paranoia of getting caught stopped me each time. She thought it was hot that it was possible to get caught, but damn, I don't want to get caught, cause I'd probably get indecent exposure charges for it. So yeah, could never do it. We didn't last too long anyway.