From my experiance this varies by age and most importantly overall health, other factors come into play here as well like who is in control of the orgasm and if edging was worked into the sex or masturbation session that made me cum.
Early life orgasms were powerful, dizzing and would easily make me want to nap right after.
At this young age I wouldnt be surprized if my cum could hit the ceiling while cumming.
As I got older and I guess my prostate got more and more inlarged from too much sex, the amount of cum and how strong it would shoot out was much less intense yet the sensations were just as incredible as my earlier years.
My heart condition has effected the amount of blood that get pumped to my penis and also effected the need for a nap after sex, since I do not have as much blood flowing to my penis I do not feel as tired when I am done.
I did have a weird experiance with a masturabtion session a few years back, I was sitting down on my couch using a Fleshlight while wathcing some porn and working on edging to try and make myself last longer while having sex with my wife.
I had got so horny and intense getting myself closer and closer yet denying the big O as long as I could when I finally came the sensation was so powerful like an explosion from my prostate that the cum could not get out quick enough ( perhaps because I was sitting or other health issue yet undiscovered I could feel the cum being released from my prostate yet not much came out I felt a very sharp level ten pain coming from my right crotch area like a tube the cum flows through blew up like a ballon and popped.
Once I felt the popping sensation the pain level reduced to about a level 2 but stayed sore for weeks afterwards.
I went to primary care doctor and she claimed if anything burst inside of me I would be very sick and not sitting in her office.
I went to a few other doctors and had complete checks and blood work etc and to this date no one knows what happend.
My guess is I took the edging session way too far and built up way too much pressure which I think did inflate but not rupture one tube that carries the cum to my penis.
I know I will no longer have sex of any type while in the sitting posistion after this event.
It has been a while since I had this issue however the side effect still remains when I cum now it is not as much as before and no where near as pleasurable.
Because of this issue I feel if I go too long without cuming the fluids build up and become acidic feeling and acutally will burn when I urinate or cum.
I have found that prostate massage will help purge my system of this old fluid making me feel normal again. ( as a side note since this issue happened I can no longer drink any type of soda or acidic fluids without feeling pain in my crotch area).
In short as mentioned by another member all men are different and each cum session is simular yet varies in intensity from EHH to OMG I think I am going to pass out from the intense pleasure.
For me the best feeling mindblowing orgasm is accevied through edgeing and use of a prostate massager-vibrator and cock ring. and now VR
In short thank God for lovehoney and the wonderful toys you supply the world.