Not a lifestyle hack, but it’s NSFW thing most guys probably don’t know. If you are limber and thin, have strong abdominal muscles and a sense of adventure, you can make your asshole open up and suck in a bunch of air. Lie on your back with your legs over your head – toes touching floor near your head. Relax your rectum and tighten your core in a way that sorta forces your ass open by a vacuum created by abdomen. You can then push and pull and essentially “suck and blow” with your asshole, it sounds gross but it’s really interesting and funny.

I discovered this while in gymnastics around age 12. Our group was being led through stretches before practice, and the dude demonstrating (older guy, 20s I guess) made us lie this way to stretch. He got up to walk around and instruct people on form, then got back into position while we held the pose. After he put his legs over his head and his feet on the floor above his head, I heard a loud sucking “SSMMMOOOOSH!” sound come from his ass. He sorta snickered a little himself, but nobody said anything about it and quickly changed to a different pose. At first, I tried to convince myself he just beefed by accident, but I knew it didn’t sound like escaping air, it was a sucking smoosh. I was fascinated enough to keep trying the same thing until one day the same thing happened to me. With practice you can control it more, and if you are thin enough you can actually create such a vacuum that you can naturally gape open like you see ppl do in pornos, but without any penetration.