In Response To 'An Unusual First?'

I've masturbated using the heel of my left foot for many years now. To be honest, I always wondered if anyone else does it as well.

Another technique I use, besides the one you described, is sitting on a chair with my left leg bent at the knee so that my foot is in the chair and my heel is pressed firmly against my clit. My right foot is usually on the floor while I rock on my left heel until I climax.