I've been doing it for over 50 years (really!) and I ain't blind or crazy yet although some might argue with that last part. No plans to stop...ever! It's one of the joys in life! I discovered it when I was about 12 and got poison oak on my little weenie (probably from taking a piss outdoors). I was rubbing it to relieve the itch and....HALLELUJAH! THANK YOU JESUS! Been doin' it ever since!