lady of convenience
A girl who’s used for sex, called a girlfriend, and tossed aside when the guy gets a better offer. She’s just a quick fling until he finds something better.
He said she was his girlfriend, but when he wanted a quick fling, she was just a replacement.
She went to the event with him, but when he got a hotter offer, she was gone.
He used her for sex, but when he got a better one, he left her in the dust.