First of all, Interpreneur, you can increase your penis length and girth. This site has the info, and it works:
Jelq and Jelqing - Penis Enlargement Manual
Second, Dr. John McDougall contends that meat consumption decreases your ejaculate volume in this article:
The McDougall Newsletter July 2003 - Meat In The Human Diet
It therefore stands to reason that by cutting out meat you might increase your ejaculate volume. Strengthening your PC muscle might also help with that, and provide many other benefits as well.