People ought to use their bodies the way they were meant to be used. You can look and listen with your eyes, touch and hold things with your hands, speak and swallow with your mouth, and walk with your feet. Men usually have sex by putting their penis inside a woman's vagina. Then, though, people get clever. They keep coming up with new ways to enjoy sex more, and boy have they found some really weird and unusual ways to use their bodies to get the most out of it!