My Favorite is to sit in the closet and listen to their lovemaking and occasional peek around the corner. I wait for him to call me when they need something or listen for his orgasm. Once I hear him cum (the whole house can hear that), he will doze off. Thats my signal to come in and bring water and a clean towel. He ejaculates a lot, so I have a hand towel ready for each of them, but especially for my wife to soak up the semen that drips out of her. If he is asleep, I will suck it out of her while they both nap.