I have tried variuos forms of warm-ups and cool-downs, from electric heaters to hot bags of water and the best warm-up that provides the proper amount of moist heat to my groin area is a slipper that I found that has flaxseed and rice in it. The slipper is a therapeutic slipper that I found that relieves aches and pains in your feet. The slipper is perfect because it fits you me like a cup when you place your penis inside it and have the foot part resting against my groin. All I have to do is microwave it for 1.5 minutes and it stays warm for a decent amount of time. It really just depends on what you need and what gets the job done for you.