A SECRET WEAPON FOR SEX

知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。You might want to chill out the sphincter muscle with the anus — the muscle you squeeze when you'll want to Have a very bowel motion but must hold out — to obtain anal sexual intercourse. So it’s imperative that you check out to stay peaceful