A common suggestion for getting the blood flowing is doing heli shakes. Spin that bad boy around a few times and the blood comes flying. I have found a much more effective way of accomplishing the same thing, with the added benefit that you can do these while walking also. Before I start my routine and after, I do something I call the Fire Starter. With your palms facing each other clasp your unit's sides and rub it vigorously. I push my fingers into the base and move up and down my shaft and over my glans. When doing the top and bottom of my shaft I take my hands with my palms facing up and grasp my unit at the top and bottom and repeat. When doing the top and bottom your top hand's knuckles will be rubbing your shaft, the bottom hand's palm will be doing the other half. Again, I move my fingers deep into my pubic bone area and run my hands up and down the shaft. I also do circles with my hands for another kind of massage. In a matter of seconds my unit has been completely invigorated by these. When I do a long LAS session my glans often has puffy lines on it. A few seconds of Fire Starter and my unit is good as new. If you over do your routine and there is soreness in your unit, these will work wonders on that. I have been doing these for months. I mentioned doing them while walking. If you have access to your pride and joy through loose fitting pants you can do these as you walk. I do them throughout the day whether I did a routine or not. On your rest days you can do these throughout the day as they will help promote good blood flow and relaxes the smooth muscle cells which promote quicker healing.
I believe these will increase inner temps, but how much I have no idea. But for sure it is a great pre-workout exercise that will loosen up the smooth muscles that you want to work on. As I stated earlier, it is also a great post workout relaxer. On my rest days this is the only exercise I do.
These are more effective if you do them with dry hands and unit. You get better friction when dry. I do these for a minute or two prior to starting my PE routine and substitute these for the more traditional warm up routine requiring ten minutes or so of applied heat.