the volume of semen. I'm 59 yrs old and have noticed that the volume that I cum is diminishing and thereby decreasing the length and intensity of my orgasms.

Read reviews, find really good providers, engage in lots of nasty foreplay.  One provider had me cumming for a good 8-10 seconds continuously.

i've heard eating peanut butter is good
for increasing load volume.

I agree long foreplay before the act and finish leads to a much larger deposit.

Had a provider comment on the amount I came even after the second pop and I never thought I came that much.