As far as the porn goes, there is much more to it than the eye can see. Including standard movie tricks that can make a guy cum like a fountain. What you do not get to see is a tiny plastic pipe attached to the side of his cock, plus loads of skilled editing.
In real life? Nope, there is no way for you to know in advance. You might be the 2nd, the 3rd or whatever guy servicing his cock in a very short span of time. Or he might be having a bad case of blue balls and is going to shoot an amazing load. Plus all the physiology of it, like in how dehydrated or actually hydrated his day was.
So, take it as something like a lottery draw, if you will.
KD
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