things like drinking raw eggs or eating foods with gelatin are -according to some- ways of increasing volume or thickening.
for a while, i had a regimen of eating a box of junior mints (made with gelatin) 3 to 4 hours before i knew i'd be cumming for a girl...facially or orally.
i can honestly say it did seem to thicken my load, and apparently the peppermint oils carry through a bit as i did get compliments that my cum was sweeter and not fishy tasting.
i never ate more than one box in prep though, so i can't recommend that it works any better..i figured i'd burn off the calories of eating a whole box during the sex..hopefully.
i've never been much of a distance shooter after my teens. i kind of just gush out in two to three heavy spurts- more of a rodney moore than a peter north.
as you can see from one of the sessions, my load was very thick and keeps its shape on her nose and the thick string underneath...this was a good 30 seconds after unloading.