From all the online articles/doctors' responses I have ever seen about this topic, you can do absolutely NOTHING to increase your semen volume other than not cumming all the time, by eating well and remaining healthy, drinking lots of water, and laying off drugs and alcohol. There are things which you can eat to change the taste of your load, but everything I've ever read about these "super-spunk" herbs and supplements is that they're ineffective and a very expensive placebo.
I've also heard that some guys in porn will actually have their own semen stored and injected back into them so their volume is huge for a big moneyshot scene. I think that's just folklore though.
Who cares? Enjoy what you've got, and use it well and safely! lol :nanner: