Uhm, no, it's not 50/50. There
is sperm in pre-ejaculate.
Quote:
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Delayed condom use is defined as putting on a condom after sex with penetration but before ejaculation. This technique doesn't prevent sexually transmitted diseases (STDs). That's especially true of STDs spread by skin-to-skin contact, such as human papillomavirus (HPV) and herpes. It also increases risk of unwanted pregnancy and other STDs such as HIV infection. That's because pre-ejaculate -- fluid emitted by the man before ejaculation -- often contains sperm as well as cells that can harbor the AIDS virus.
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http://www.webmd.com/content/article/57/66064.htm
I would suggest picking up the book Taking Charge of Your Fertility so that you can better understand your body, your cycles and how to prevent unplanned pregnancy in a natural manner if you aren't planning on using other forms of birth control. Do not confuse this with the "Rhythm Method." It is the Fertility Awareness Method. Knowing about your bodily functions will only help in understanding and prevention.