Of course, there was the time when my old boyfriend was horny first thing in the morning and we had sex doggy position (which I love) and then I went off to work and at noon I discovered dried cum on the back of my head in my hair. Then I knew why people were snickering behind my back all morning. Be careful of those huge loads launched into space!
It varies. I've had some fairly intense ones that produced very little (this always seems to happen during the 2nd or 3rd session with my girl).
But generally speaking, the more semen the more intense, at least in my case. And I absolutely cum harder during sex with my girl than I do when masturbating alone.
LOL, I surprised both of us the other night when I shot off a HUGE load that seemed to travel 4-5 feet! But that's pretty rare for me.