sexuele.tumblr.com/post/22303046631/
sexuele.tumblr.com/post/22369947667/
sexuele.tumblr.com/post/22373797051/
sexuele.tumblr.com/post/22374529320/
sexuele.tumblr.com/post/22435546516/
i like that the person who made this diagram only put the numbers