Question

why doesn't a women body reject the sperms since it is an external organism , instantly
i.e, it should have produced the antibodies against it right?

Answer 1

If women's bodies rejected sperm, we wouldn't be here. We're designed to reproduce and rejecting sperm wouldn't allow reproduction.

http://boards.straightdope.com/sdmb/showthread.php?t=651933

http://health.howstuffworks.com/pregnancy-and-parenting/pregnancy/conception/conception-process.htm

Answer 2

actually, women do react to foreign material. I have known of one severe case in my lifetime. About 12 percent of women develop allergic symptoms severe enough to warrant doctor visits. usually, the symptoms are not severe, as the material is not retain for a prolonged period.

see https://www.google.com/search?q=allergic+to+sperm&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-beta

Answer 3

Actually the woman's body <I>does</I> reject the sperm, that is one of the reasons why, of the millions of sperm in the ejaculate, only a few reach the ovum.

Answer 4

thank you