After 60 years of dedicated wanking I have just found another method.
I drop my pants and kneel in front of the toilet bowl, lay my semihard cock on the seat and lower the lid onto it. With my hangers swinging against the bowl I rock backa nad forth while working my nipples. The feeling is great and I can cum off as soon or slow as I like. When I shoot my load it goes straight into the bowl and I lift the seat and squeeze out the rest of my spunk, wipe up with a tissue and flush the toilet - great!
Franky