A Locked Slut
A locked slut is a person who’s stuck with one lover and will be a total mess just for them, even if it means doing something absolutely stupid.
My brother is a locked slut. He let his girlfriend eat a whole pizza in one bite just to make him laugh.
She’s a locked slut. She wore a chicken suit to a date and called it a fashion statement.
That guy is a locked slut. He let his girlfriend paint his face with glitter for three hours.