Spermicides need to be inserted into the vagina about 15-30 minutes before intercourse. Foam and gels are applied with an applicator, suppositories and film are manually inserted into the vagina. They are convenient and easy to obtain. They also act as a lubricant and STD prevention with any other method. Warning though, some people are allergic to the spermicide and may develop irritation.
Spermicides are more effective when used with a condom.
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