Cock Spulunking
If you can handle a little pain and know how to be gentle, it feels awesome to use eurethral penetration while masturbating. I take a Q-tip and slowly!!! guide it into my urethera and start to masturbate. it takes a lot longer to cum so it's way more intense. It is the best feeling i've ever had while masturbating. It feels strange to pee afterwards, but I think that's just because you've stretched out your eurethera, so long as you didn't pierce it (which i've done, too . . . be careful)