Spermicide

Spermicide is a contraceptive substance that destroys sperm, inserted vaginally prior to intercourse to prevent pregnancy. As a contraceptive, spermicide may be used alone. However, the pregnancy rate experienced by couples using only spermicide is higher than that of couples using other methods.
Use: insert the spermicide deep into the vagina just before intercourse, Wait about 10-15 minutes after you insert spermicide into your vagina before having sex, Insert spermicide no more than 30-60 minutes before having intercourse. When ejaculation occurs, the sperm will usually start swimming towards the cervix. However, spermicide is designed to kill the sperm before they reach the uterus and potentially find their way to an egg. When used correctly, regular condoms are 98 percent effective as a form of birth control.