(You can call masturbation 'having sex by yourself' if you want)
In my old age I've gone down to about five masturbation sessions a week. My mind is still in the gutter 24/7, but my body can't keep up with my dirty mind. :-(
Back in my twenties, when I was masturbating thrice a day, I became
impotent from over-dosing on porn. So I try to avoid using too much porn, and rely on my imagination instead. Now if I even glimpse a titty I gotta go wrestle out another orgasm... actually I've always been like that.
Because of my anti-depressants, I have to jack-it like 20 minutes to cum (and then I sprinkle on whatever extra time I feel like); the good thing is that the orgasms feel better now than back when I was cranking them out in 5-10 minutes.
My proudest masturbation achievement is when I did it for over 5 hours, non-stop, with erection, edging most of the time. When I finally came it hurt, sprayed all over the room, and was really hot and clear. My penis was a bruise (almost all black/purple) and my balls ached so badly I could barely walk for a couple of days.
Too much information?
Yep, and that is exactly the trick to do it, I can orgasm 3 or 4 times in a row, refractory period is essentially non existent, took years to develop though.
Oh I've been jealous of this. I can't keep my erection after I cum. Apparently some chemical releases in a guy's brain when he cums that says "penis go soft, now go to sleep".