OK then, I guess it's semen calculus time!
An average ejaculation is about 10c.c.'s or the equivalent of a spoonful.
Say a man ejaculates once a day between the ages of 14 and 65. So he's ejaculating regularly, each day for 51 years.
51 years is approximatly 13503 days (counting/factoring in those leap years), so that's 13503 x 10c.c.'s of semen! That's enough to drown someone in it!
In my case, I ejaculate a bit more than this (about 1/2 to 3/4 a shot glass... and yes, I DID measure this!), but less often than once a day. When I was 14 up to about 20 or so, I would masturbate about twice to three times daily (for real), and these days, I masturbate anywhere between 3 to 5 times a week, not counting the sex I have with my wife.
I am certain that by now, myself, I must have ejaculated the equivalent of a garbage can's volume worth of semen.
Now that's enough to drown a racoon in! (Don't ask; I've had Racoon troubles at home)
Hope this helps answer your question.
PS: Oh yeah, and the male p*rnstars don't necessarly ejaculate more than us "regular" folk; it's just that they do it in front of the cameras for the whole world to see! Except Mr. Peter North himself who, by now, deffinatly must have juiced the equivalent of a small bus' size! But that's because he is a freak of nature!