OK, here's the game. We have always enjoyed masturbating together and watching one another. We've played this multiple times. The woman is completely dressed, her partner is naked. She sits in a chair facing him. He is on the couch with his legs spread wide and a large erection. He has a bottle of body oil and applies it to his cock and balls. He begins to stroke himself while she watches. She now needs to determine when he is about to ejaculate. When she thinks he is close to cumming, she gets to "call it" whereupon he stops stroking and she takes 5 strokes on his cock.