Purposely Blocked Ejaculation

Lately I've been fascinated by the idea of blocked ejaculation. To see a penis pulsing in orgasmic contractions, but with nothing coming out, knowing the pressure that is being built inside, just makes me want to orgasm right away. Or maybe it's doing something contrary to what the body intends that gets me excited. I don't know exactly. I have experienced it. The first time I was very young. My even younger friend said he had heard about the 'million dollar spot.' Evidently it's a Taoist or tantric practice. If one presses in just the right place between the scrotum and the anus, the ejaculation is harmlessly blocked. The ancient practitioners said it somehow preserves the 'male energy'. So we tried it. He jerked me off. Just as I was reaching the point of inevitable ejaculation, he pressed the first two fingers of his other hand hard against my perineal area. He pressed really hard and it hurt like hell. I screamed, but he didn't leg to. The semen was indeed blocked. Instead of it being a wonderful experience, I was mad at him. The blockage isn't what hurt. He was just pressing too hard. He didn't bruise the area or anything. As soon as he let go, the pain went away, as did my anger. Over the next few weeks, I jerked off many times remembering that. I had forgotten the pain part, and just liked how no sperm ever came out. I tried pressing on my own perineum a few times, but didn't press hard enough, or didn't press in the right place. A few years later, I tried squeezing the end of my penis as I was cumming. That worked with no pain. It was interesting, but not super-amazing. I had a girlfriend who was very skinny, and had skinny fingers. She squeezed the tip of her little finger into my peehole as I came. That was super-erotic and I loved it. She pulled her finger out about 30 seconds after I came, and the sperm spilled out. I wished she had kept her finger in longer. I saw a video of a guy who super-glued his peehole and came. Of course, I had to try that. I was scared to death that I wouldn't be able to remove the glue afterward to reopen my peehole, but it turns out, that's not a problem. The bigger problem is getting enough of a seal. The glue doesn't stick as well as I'd like. I did it a few times. Each time, as soon as I ejaculated, I immediately pried my peehole open and let the cum out. For some reason, right after cumming, I couldn't stand the idea of the cum being locked in there. I started to wonder if the glue might be carcinogenic, so I've quit doing that. One day, I folded up some toilet paper to make a padded ring around the tip of my dick. I wrapped a rubber band tightly around that and jerked off. It did indeed block the cum, and  I was somehow able to let myself retain the cum for a while. My urethra started to itch after ten minutes, so I let the cum out. I guess the PH balance that the urethra wants with urine is a bit acidic, and I'm guessing semen is alkaline. I've tried blocking in pee, but that sets off some sort of involuntary contraction that hurts like hell, as the urine squirts out past my best efforts to lock it in. I'd like to force the cum back through my urethra into my bladder. I haven't succeeded yet. Part of the reason is that my mood changes right after I cum. I become uninterested in further experimentation. On the occasions when I've tried, I don't get it right, and the sperm ends up coming out my peehole or somehow dissipates. I did manage to do it to a friend of mine, With his prior permission, as he started ejaculating, I squeezed the end of his penis so it couldn't come out. Interestingly, his orgasm seemed to last twice as long. When he settled down, I methodically, started squeezing my fingers down the length of his penis toward his ballsack, then through his ballsack to his perineal area. He wasn't quite sure, but he thinks the semen did go into his bladder. We know it didn't come back out. I forgot to ask him, and I don't think he noticed, whether when he next urinated, if it was cloudy. We'll have to try that again soon. I think I'll suggest we do this when he has a full bladder, so he can pee right afterward. He likes that kind of experimentation, so I'm sure he'll be all for it. And that's where I am today. Your thoughts?