I have masturbated since I was 13. I'm in a very happy marriage, but there are times when I need to wank alone as it's always been a great way to release my cum.
I discovered this simple technique only a few years ago, but I've been doing it regularly since. The edge of the sink basin is just the right height for my cock. So I place my hard 7.5' cock on the sink edge and initially slowly thrust so that the edge of the sink pushes back my foreskin. The sink edge has to be dry otherwise this technique doesn't work well. I have a long foreskin but it also fully retracts, so I can push my cock a long way along the edge of the sink until the skin is fully retracted.
The sensation of getting to the end of the foreskin, then pulling it all the way back on a forward thrust just sends me crazy. I speed up. I keep doing this until I can stand it no more and thrust my cock until the cum spurts.
I've had some of the biggest cums of my life with this technique. Some of these cums are so powerful that the spunk shoots over the top of the taps on the other side and against the tiles behind the sink. The neat thing is that I can normally just wash away the spunk down the plughole, unless my cum is so strong that it shoots everywhere!
I am about to go and do a sink wank as writing this has made my cock super hard.