[Iguana]

I think the goal here is to "solidify" the collagen. Heating collagen puts it in a more pliable soft state which is easier to stretch. So the process is too elevate the penis core temp as much as possible without burning, stretch, and then hold the stretch and cool back down. Colder should be better in that the colder the collagen is the less likely it is to return to the previous resting state. That is why ice and cold packs are recommended. The ice and cool packs help accelerate the process.