it seems like after i masturbate the left side of my sack turns left. my penis kinda curves to to the left so mabe its the way it sits on my sack when its unerect and warm or something. its in a perfect line though seperating the normal color to red, and it seems like it goes away after an hour or two. any ideas?
Left side of sack becomes red
In foetal development, the sack is made from the bottom part of what in a girl would be the outer vaginal lips. The two parts come together and fuse - you can sometimes see the line where they joined (the raphe). If one side was better supplied with blood vessels near the surface than the other, that side would get redder when it heated up with excitement. - Just a theory.