Spermicides are a kind of birth control which contain chemicals that stops the sperm from reaching the egg and fertilizing it.  

Spermicides are put inside the vagina before sexual intercourse (or penetration) to prevent pregnancy. They are put inside the vagina right before penetration which helps in preventing the pregnancy in two ways; they block the entrance to the cervix so that the sperm from the male cannot reach and hence fertilize the egg, and stops the sperm from moving well enough through the reproductive tract of the woman to reach the egg. 

Spermicides can be used by themselves or in conjunction with other modes of birth control. This usually increases the chances of preventing unwanted pregnancies. Using a spermicide with a condom, for instance, gives you extra protection. Condoms also prevent the spread and contraction of sexually transmitted diseases between partners. There is a caveat, however. You do need diaphragms and cervical caps in order for spermicides to work. There are different kinds of spermicides too. 

They come in many different forms and materials: creams, gels foams and suppositories. Suppositories are soft inserts that melt into a cream when you put them inside a vagina. 

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