sympathectomy
Verb: the act of feeling sorry for someone due to their recent or constant lack of sexual activity and having sex with them anyway out of sympathy. Also known as a mercy hump.
Rob: "So, Chris swears he gonna get laid on his date tonight."
Josh: "The only way he's gettin any is if she gives him a sympathectomy."
Josh: "The only way he's gettin any is if she gives him a sympathectomy."