The cum volume is mostly physiological. Some people naturally have more volume just like some have more sperm count. But the sperm count doesn't necessarily dictates volume. You could have a vasectomy and still have a decent volume.
You can increase volume by reducing belly fat and thus smaller, healthier prostate. This allows for more urine and ejaculate flow. Drinking a lot of water also helps a great deal. But it has to be a lifestyle routine. Not just drinking a galon of water right before cuming. Celery, banana, watermelon, spinach, nuts and eggs are all good for sperm count. Also avoid wearing tight pants and tight underwear. No underwear is best. Let the boys get as much cool air as possible. Even some sun if possible. It's healthier and you'll smell better for your partner.
If you masturbate, never rush it or force it or you'll teach your dick to come before a good buildup. The body needs at least two to three days to completely replenish the sperm supply. So good workouts and cold showers for three days, then celebrate with the fireworks.
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