Foam is a vaginal spermicide which is placed into the woman's vagina using an applicator. Fact sheet describes this birth control method and its advantages and drawbacks. From Emory University School of Medicine.

Consumer information on the advantages, limitations, and use of spermicide.

Feminist Women's Health Center fact sheet on contraceptive foams, creams, jellies, and suppositories.

Spermicides are chemical products inserted in a woman's vagina before sex that inactivate or kill sperm. This fact sheet discusses their properties, advantages, effectiveness, and disadvantages.

Emory University fact sheet on this paper-thin sheet that contains a chemical that kills sperm.