How do you know?

[JDMFantasy2k]

it can feel different everytime for the man. It all depends on how aroused you are, and how much you prolong the session. Remember that guys can feel when they're close to "the point of no return" (when you can't stop the orgasm no matter what you do). So basically if you get close to orgasm, and then stop the stimulation (in essence teasing your body) and repeat a couple of times, and then proceed to orgasm all the way, it will be very intense.

then again there's always those morning quickies just to get the buissness done for the day where it's about as powerful as a fart.

so i'd have to say to answer your question that it must be different from person to person, especially seeing it can be so vastly different from session to session.