There might be several reasons why an individual might wish to do this - none of them should be taken lightly. The most obvious might be to prevent certain types of cancers (like prostate). The first step is to discuss your situation and thoughts with a medical professional. If you do not have one (or don't feel comfortable) you can contact the men's health board on WebMD for more information:
http://boards.webmd.com/webx/topics/hd/Mens-Health/Mens-Health-Urology-with-Sheldon-Marks-MD/
Also See the wiki on castration: http://en.wikipedia.org/wiki/Castration#Chemical
Here's a webmd article: http://www.webmd.com/prostate-cancer/orchiectomy
Note: castration can be performed chemically, without actual removal of sex glands/organs:
http://en.wikipedia.org/wiki/Chemical_castration
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