The contraceptive sponge combines barrier and spermicidal methods to prevent conception. This animated video shows how pregnancy occurs with the process called ejaculation; the video also gives an explanation on how the birth control sponge prevents pregnancy temporarily.
Sponges work in two ways. First, the sponge is inserted into the vagina, so it can cover the cervix and prevent any sperm from entering the uterus. Secondly, the sponge is produced with spermicide already inside of it, which is used to prevent the sperm from moving.
The sponges are inserted vaginally prior to intercourse and must be placed over the cervix to be effective. Sponges provide no protection from sexually transmitted infections (STIs).
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