Thrusting related to semen volume?
 

I've found that when masturbating, if I buck my hips and thrust as if penetrating, I ejaculate much more than if I don't. Does anyone else have similar experience? Is there a physiological reason for it?

Mate its impossible to be a pshycological thing, as you can only shoot as much semen that has been made by your testes, In all probability when you buck your hips its probably because you havent had a tommy tank in ages and your gagging for it and youve got a build up of semen which is why it looks like theres more!

Tommy tank...haha, I like that one. I love British rhyming slang :D
I don't think it's psychological either. Physiological is different, it pertains to stuff like reflex actions, things like getting a hard-on when you see a naked woman.

You would have to do it for me both ways then I can tell you exactly ;)

So kind of you to offer you services in a research capacity Lilith.....just let me know where the libe starts

Excercise your PC muscle! The one between your testicles and anus. Squeeze it, timing it to breaths, over a few weeks while driving or watching TV.

As it strengthens, stimulate it while masturbating or fucking (or have a willing female hand help !). You will be able to choose when and how strong to cum, and you will probably soak the wall behind you!

I should add that Lilith is a quantitative genious with inferential statistics. Give her the numbers/data... and the answer will spew forth.

He means I can bullshit with the best of 'em;)

Yes, the answer will spew forth.... somewhere in Lilith's vicinity hopefully!