I wish! I’ve tried and tried, it usually comes to the point where I can’t take anymore and just finish myself off.
It has only happened to me once or twice. I was so horny and turned on. The next thing I knew I had ejaculated into my boxers without touching myself. I think it can be done under the right cirmcumstances or with the right stimulation.
I almost had something like that happen. I was just walking around, I had company over and I felt like I was going to have an orgasm. I thought to myself oh no! This won’t be good and it subsided. I wish I could have that feeling again, this time I won’t be afraid.
Numerous times I've had orgasms from prostate stimulation. My favorite way is in a hot bath with my 8" silicone butt toy which not only massages my prostate, but give my anus a good stretch. There's something about the relaxation from the hot water along with prolonged prostate stimulation that created amazing orgasms. These orgasms can be incredibly powerful but with minimal ejaculation. Sometimes my cum is like curdled milk or cottage cheese rather than it's usual viscous state.