(verb) - To have sex with someone in return for material things (i.e. - money, drugs, alcohol, clothing, jewlery, etc.)
(n.) - 1. A relationship in which there is a sugar daddy/sugar baby arrangement or a sugar mommy/sugar baby arrangement
2. A mutually beneficial arrangement
She benefucks him every weekend, and he is clueless to her using him.
My sugar daddy gave me a new car for Christmas; I'm his favorite benefuck.