easy lay
an easy lay is a girl who doesn't care if you're a mess as long as you're willing to pay for the mess
'I walked in with a hangover and a broken heart. She said, 'That’s even better.''
'He asked me if I wanted to go to the mall. I said, 'Only if you pay for lunch.'
'She said I was a 'one-night wonder.' I said, 'That’s what you pay for.'