Contraceptive Foam http://www.gynob.emory.edu/familyplanning/foam.cfm
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.
Spermicides http://www.rho.org/html/cont-spermicides.html
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.