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Being physically healthy helps, as well as withholding orgasm for a few days.
The longest orgasm I ever had was the first time I tried putting my pp in my exgf's butt. I had been anticipating that moment for years, as it was my fetish, and I had a lot of psychological pressure on that. I loved her and I was afraid she was unwilling to do it and that it might meant I'd never get to try out my fantasies if I wanted to be with her forever. When she accepted it was like the most unlikely dream in my life was being fulfilled, I really had that shit as super high importance. Physically it was amazing, but I think this psychological weight influenced it a lot, and I got the most intense orgasm of my life for at least 10seconds straight. It was literally life changing for me. The following times were also incredible, but that first time was like I finally discovered what pleasure was.