I have an autistic shut-in girlfriend. It's great.
She has no friends. Zero. She wears no makeup. She spends her free time writing erotic fanfiction and other teenage girl crap even though she's close to 30 now.
She's attracted to vampires and werewolves and dragons and weird stuff like that. This is another reason I know she'll never leave me unless I abuse her or give her an actual REASON to. She's not attracted to humans.
She let me fuck her whenever I want because she loves and cares about me and because she enjoys the physical act of sex but she fantasizes that I'm something else other than human when I fuck her. I don't mind. Whatever makes her happy.
I'm aware of how this relationship sounds but she's assured me that she wants to be with me. I've told her that she doesn't have to have sex with me in order to stay with me but she wants to. We sleep in separate bedrooms because she wants her own space and I can't stand sleeping with someone.
Our relationship is weird but it works. To be honest I don't like women. I don't hate them but I just don't find them appealing or interesting at all. My girlfriend doesn't look or act like a woman though which is great for me. She owns 4 pairs of shoes (one for summer, one for winter, and a spare of each).
She's like a shut-in bro who shares most of my hobbies and interests, one of them being sex. I really can't imagine a better relationship.