Another feel good is while in bed with the covers over you, pull your foreskin back as tight as you can with one hand and with the other hand move the glans up and down against the sheet or blamket. You can rub the whole glans this way, top and bottom, by moving your penis from your belly to your balls. You can also move it from side to side for a really erotic feeling caused by dragging the inner edges of the end your urethra across the sheet. Moving it around in a circle is another way. The only downside is you have to stop when you come because it doesn't work well against a wet sheet.
Holding it with one hand and rubbing the palm of the other hand over the tip using all three of the previously described motions works well too and you don't have to stop when you come. The come lubricates your hand and you can keep right on going on the tip for as much pleasure as you can stand.
Having an uncircumcised penis is just soooo much fun. Touching and rubbing all the inside parts of the foreskin and the bare glans that gets protected by the foreskin when not in use is just the ultimate in pleasure.
I say there's nothing wrong with using a vacuum if you're careful. I've vacuumed my penis regularly (a few times a week) for the last 30 years, and I've never suffered any harm from it.
I currently use a small shop vac, powerful enough to do the job without causing any damage. I reverse the hose so the narrow end is in the canister, the wider end loose. The wide end is wide enough to accommodate my entire erection without being too tight. I wrap my fingers around the point where the narrow end enters the canister and use them to regulate the suction by sealing the gap closed. By varying the intensity of the suction from moment to moment, I keep myself in a perpetual state of excitement until I'm ready to climax. Then, I seal the gap for maximum suction strength. Moving the hose up and down my shaft to find the "sweet spot" increases the power of orgasm immensely.
Occasionally, I remove the hose and insert myself directly into the canister. It is also wide enough, and the fan blades are nowhere in sight. Both methods work wonderfully for me. The orgasms are some of the most intense I feel when I'm not actually with a woman.
Supplement your pleasure by including other things that excite you. Attach a rubber sex toy to the hose, for example. I wear all my black leather when I do it (also when I'm with a woman), and occasionally attach sex toys as well. Put it all together, and I have the greatest masturbation sessions! I even get women to vacuum me sometimes.The shop vac has a wider hose than most normal vacuums, which allows my penis to vibrate inside. It is the vibration caused by the suction that results in orgasm, more than the suction itself. And I DID use my vacuum a third time the other day...
(in case some one wonders i started to ejaculate when i was 11)