A while back my wife got me to go to the spa for his-and-hers massages, I'd never wanted to spend the money before. The massage was nice and relaxing, but the best part came later. They had extended locker room/shower/sauna/spa areas that were gender segregated and okay to go completely naked, not something I'm used to. After the massage I showered in one of those showers that has 12 shower heads, so one of them was spraying at my privates pretty much no matter which way I turned. Not that I'm complaining mind you, it did feel nice enough. I got hard and started to stroke it. But I didn't orgasm and got the erection down and left the shower.
I was going to just get dressed, but then thought I may as well get in the hot tub for a minute, as I'd never been in one naked before. I have, however, enjoyed the feeling of water jets spraying on my penis or ballsack and have experienced climaxes, but usually I'll be stroking the shaft while having the water spray my balls or something like that, in any case it always involved my hands.
So I got in, not even necessarily with the intent of sexual pleasure or release. Especially after the tease of the shower, I couldn't help but gravitate to a position where my genitals were in the line of fire of one of the jets.
In the past not only was I wearing swim trunks, but I would face toward the jets; also I generally found the spray could either hit my balls or my dick. But I couldn't work out a way to get good stimulation on both at the same time. Here, however, I figured out that if I crouched down just right with my butt just above the jet, especially if I kind of held the shaft down, the jet was able to do nice things to both my penis and my lower parts. Most of my orgasms are induced by stimulation of both and I've learned masturbation techniques to do this, and my wife gets on top during sex and reaches back and rubs me down below.
Anyway, it was feeling nice, but I'm used to getting nice feelings from the jets, just not to orgasming without hand action. But in this case, the feeling built, and built, and I started to feel the semen rise, then BAM, a spurt of my semen shot out of my penis and into the water surrounding me in the hot tub and I got the good feeling. My cum was about halfway over before I could even believe that I had experienced an essentially hands free orgasm. I did have my hand on my shaft, but just to keep it in position to get the jet spray, not stroking or rubbing as I usually do. It was so satisfying to feel my balls emptying themselves and giving me amazing pleasure without having to earn it with my hand!