How can I cum more?

[hungsum]

I've been blessed with a nice cock a little bigger than average (just under eight inches)
with small "high and tight" balls

watching some of these porn movies and pictures
I realize I don't cum very much compared to others,
I rarely squirt, it mostly just oozes out.

So my question is, why, is it diet? or is it just genetics?
Is there anything that I could do that would increase my quantity of cum
and make my dick spurt instead of ooze?