A Locked Slut
A locked slut is someone who’s stuck with one person and will be a total whore just for them, even if it means doing the nastiest, grossest things imaginable.
My ex was a locked slut, she ate my socks and called it foreplay.
He’s a locked slut. He’ll do anything for his girlfriend, even if it means wearing a chicken suit to a party.
That girl is a locked slut. She let her boyfriend shave her legs with a rusty razor.