This is more of a dare than a game but fun nonetheless.
You need a minimum of 1 dick.
When you are out in public with your partner, find places to have quick sex in. Have him catch every drop of his load from your pussy into his mouth and lick you clean. Then continue about your day until the mood strikes again.
If you are flying solo, then find a place to rub one out real quick and consume all of the evidence.