What's better is to get a mirror with your tights on and stretched so that they are wedged tightly into your anus, lay on the floor with your legs up and your buttocks close to the mirror and to rhythmically stroke your nipples while looking at your ass in the mirror. I've been doing this since I was about 8 or 9, but have come to do it often as a replacement for sex or when I need a stress release.  You'll find that you will quickly become addicted to this--so beBEWARE!!