I wish I could provide more specifics on how to achieve it, but I think in my case is just the way my body readjusted itself.
All my life I practiced edging. I started at around 9-10 years old. That is on one hand. (no pun intended)
On the other hand, the years that I was in the adult industry I was having TOO MUCH sex. I really mean it, not trying to be cocky, but in a way that I think is too much for an average individual. I was having sex at least 3 times a day PLUS masturbating 1-2 times. This sex was mixed between porn and dating girls. I was in that crazy lifestyle for years, then when I quit my sex life drastically diminished. I went to work as a normal individual with the same responsibilities and same lack of time for fun.
I believe it was in this period, since I stopped overusing my reproductive system, that my body readjusted in a way in which orgasms are extremely deep, strong. From edging my whole life, fucking like a machine in a mechanical way, to having sex only when I have a private partner or a GF.
Specially if I cum inside a girl I involuntarily start thrusting just like horses do. Its like a body shake/trembling plus hard deep thrusts that Im unable to control.