Make sure the product you're buying is for birth control and is not just a deodorant. If foam seems to irritate your partner, try another brand. If he uses a condom he won't be irritated. Must be used with sperm killing jelly or cream. Place one teaspoonful of spermicidal cream or jelly inside the dome and one teaspoonful around the stiff edge of diaphragm.
Diaphragm holds cream or jelly that forms a barrier and kills sperm.
A doctor or nurse practitioner must fit you for a diaphragm and show you how to insert it. After lubricating, insert diaphragm down and back in the vagina as far as it will go. If inserted more than two hours before you have sex, more spermicide must be added. If interecourse is repeated with 8 hours leave diaphragm in place and insert more jelly. 3 to 5 women out of 100 in a given year become pregnant when using a diaphragm consistently.