Foam is safe. There are no hormones involved. It is immediately reversible. The man's penis can remain inside the vagina after ejaculation. Foam adds lubrication and moisture.
Foam reduces the risk of getting some sexually transmitted diseases.
Disadvantages Contraceptive foam can be irritating to the vagina and some people feel that it is messy. If protection against infection is important, use condoms. Some women do not like putting an applicator into the vagina. Sometimes you can't be sure if there is enough foam left in the container to provide protection during the next act of sex. Keep an extra container of foam handy.