Although I'm happily married (21+ years)to a sexy, very fit woman, we both masturbate regularly and often tell each other how, when and all the sexy details.
One of my favorite ways is in the shower.
I usually start by slowly stroking my cock with a smallish bar of Dove. As I get hard, I'll lay back in the enclosed, tiled shower and start to tease my asshole while working my cock. Then, I'll take a razor and begin to shave all the hair off my cock and balls. By now I've slipped a long, thin conditioner bottle deep into my ass, and while I finish running the razor over my very smooth skin, I pump that bottle in and out. Next to me is a bottle of baby oil which I slowly pour over my freshly shaved cock and balls. Everything is now so slick and slippery. We always have 4-5 of those elastic hair ties in the shower, now I start putting them on my balls and cock. I lay back and start jerking off with long smooth strokes and as my cock and balls swell and bulging veins appear all down the shaft, I really start pumping and with the other hand fuck my ass with that bottle. I cum so hard as thick jets of hot white liquid land on my chest and stomach.
Later that night as we lay in bed and she reaches down and feels my smooth, hairless cock and balls, she asks 'so what have you been up to today?' I say 'well, let me me tell you all about it'. And that story will come later.