Why when it comes to having men can sleep with 6 girls and hes not a wh*re but a girls is?

This is the way society has labeled men and women throughout the ages. If men sleeps around he is showing his manhood and if a woman sleeps with just one man she is very loose for anyone else to sleep with. Women does not brag to much unlike a man does to all of his friends. His friends knows who he is sleeping with unlike the females.