It involves symmetry, evolution and sitting down. Our behinds are primarily muscles that sit inside evolved pelvic bones called ischium. Four legged animals also have these muscles and use them for pushing forward when running and jumping. read more
The butt has a crack because each butt cheek is sticking out. The butt cheeks need to be there because they are very important muscles. Without them, we would not be able to stand. read more
this is embarrsing - but I have had this problem for about 2 years now. Have lived with it off and on now but its getting to the point where I can't take it anymore. There is about a 2 inch slit/tear within my butt crack. Its couple inches south of tailbone. I do not know what this is caused from. read more