The act of intentionally consuming foods containing high quantities of fructose and lactose periodically throughout autumn so that you become notably gaseous, then later season when you engage in passive anal sex with either your partner or someone with about a 10 inch (25 cm) phallus who will willingly participate, you fart as hard as you can while squeezing your anus to make an airtight seal , (the pressure forcing a large gas bubble to erupt into the man’s urethra) then quickly pushing the entire length of his phallus out and glueing the tip of the urethra shut, after which waiting for at least one month, poking a hole in the base of his ureters (accessed through the lower back) every few days to allow for the drainage of urine, then with the completion of one month, having the man slide his penis back into your anus, the sensation of tight genital friction along with the built up sperm pressure causing the seal to instantly pop off, reinflating your anal cavity. This introduces the bacterial culture which has been festering in the man’s penis, enriching your internal microbiome if ever you fall ill during winter and take antibiotics for a prolonged period of time.