Terapeutic Heat
I was reading topics here in the forum about therapeutic heat for the modulation of collagen fibers and the use of ultrasound in the heating process. Lately I have been using a hot towel to warm my penis, but I understand that the process takes a bit of time and the heat quickly wears off. Do any of you use ultrasound for heating?
Do you have any other more practical heating methods and better heat retention?