There are two things you can do. One is to prolong your ejaculation session for as long as possible – when you're aroused, your sex organs gradually secrete the fluids that make up semen, so they build up over the course of a session. That's why you almost always ejaculate more following a long, intense session than during a "quickie." The other suggestion is to drink a couple glasses of water an hour or so before you masturbate – for some guys this increases the volume of the ejaculation. (For more, read JackinQ&A – Questions About Semen & Ejaculation.)
Do you find yourself masturbating more often during some seasons than others? Why?
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