If you've ever looked into this skill, you know that training your PC muscles is the key to achieving stronger, longer lasting erections, and possibly multiple orgasms. Your PC muscles are the muscles that stops the flow of urine when you pee, but it also holds back your cum if you flex it right before orgasm.
So basically this file is designed to make you squeeze your PC muscle right before orgasm. It'll be automatic. You also train your PC muscles whenever you can. Actually, flexing your pelvic floor muscles will be like squeezing a stress ball. You do it all the time and it's a way for you to discreetly manage stress.