For a guy:when their dick can just sliiide in and they're always nice and wet...LOUD moaning... when she's encouraging... she just makes him want to go for it harder and harder every time she moans... when she can ride your dick like a pro. UNFORGETTABLE.
For a girl: When she can barely walk the next day. Bruises on the inside of her legs.
Damn boy... you were ALWAYS a good fuck. The best fuck... actually...
Something I will NEVER forget.