There have been numerous studies on both human and animal sexual behavior to help understand the fertilization process, and how to stimulate the production of large amounts of healthier sperm. One of the most common areas of study is sperm competition. According to author G.A. Parker, if more than one male's sperm occupies the same female, sperm competition will occur. Based on certain circumstances and situations, males in various species have been known to tailor their ejaculations so that they can compete with other males.
Think of it as a lottery. The more tickets you buy, the greater your chance of winning.
First off, take into consideration the meadow vole (Microtus pennsylvanicus), which is a small rodent that can be found in North America. According to Drs. Janier delBarco, and Trillo & Michael H. Ferkinthis, the meadow vole or field mouse is significant because if it detects other males in the area where it is having intercourse, it will produce much more sperm than if other males were not present.
Full story: http://media.www.wilkesbeacon.com/media/storage/paper533/news/2008/09/14/Opinion/Ivf-Success.Rates.Sperm.Competition.May.Be.Key-3426074.shtml
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