After the contraceptive sponge is placed in the vagina, it prevents pregnancy by releasing a spermicide called Nonoxynol-9. This spermicide works by killing or paralyzing sperm (they can’t move) that comes into the vagina. A “dimple” on one side of the sponge fits over your cervix to form a wall to sperm, preventing sperm from reaching an egg. The dimple also lowers the chances that the sponge will move out of place during sexual intercourse. The other side of the sponge has a loop for easy removal. There is only one size sponge
Will my partner or I be able to feel the sponge
The sponge is soft and once inserted properly you or your partner should not be able to feel it. If it feels uncomfortable, it may not be inserted the right way. If this happens, slowly and gently re-position the sponge deep into your vagina until it covers your cervix, but be careful not to push your fingernail through it. You should be able to feel the loop.
How do I use the contraceptive sponge
Wash your hands first. Remove the sponge from the package it comes in and wet it with two tablespoons of clean water. Squeeze the sponge once. This activates the spermicide. Next, insert the sponge into your vagina by sliding it along the back wall until it is up against your cervix. The dimple side of the sponge should face your cervix and the loop should face away from your cervix. Make sure that you feel the sponge covering your cervix. You can insert the sponge just before you have sex OR up to 24 hours ahead of time.
One sponge provides some protection against pregnancy for a total of 24 hours, no matter how many times you have sexual intercourse.
Here How effective is the contraceptive sponge against pregnancy
The contraceptive sponge is 88% effective with typical use. This means that if 100 women use the contraceptive sponge, 12 women will become pregnant in a year with typical use. The contraceptive sponge is less effective against pregnancy for women that have already had a baby.
Does the contraceptive sponge protect against STIs
No. The contraceptive sponge does not protect against STIs. In fact, spermicides are not recommended for women who have multiple daily acts of intercourse because the irritation may increase the risk of acquiring HIV.