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Diaphragm and cap

Remember: the diaphragm does NOT protect against STIs


Written by SpunOut | View this authors Twitter page and posted in health


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Remember that the age of sexual consent in the Republic of Ireland is 17 and the age of sexual consent in Northern Ireland is 16.

The diaphragm does NOT protect against sexually transmitted infections (STIs). Only condoms protect against STIs. The diaphragm is 92-98% effective with very careful use, higher failure rate with less careful use.

The diaphragm is a flexible rubber or silicone cap that fits inside the vagina and covers the opening to the womb (the cervix). A doctor or nurse fits a diaphragm for you to check the size and to teach you how to use it properly. It should be used with a spermicide that kills sperm. Spermicides can come in the form of creams, foams or jellies.

Advantages of the diaphragm

  • The diaphragm doesn’t affect how regular your periods are.
  • It may protect against cancer of the cervix.
  • You only use it during sex and can put it in whenever you want before sex.
  • There are no long term health risks associated with the diaphragm.

Disadvantages of the diaphragm

  • It doesn’t protect against STIs.
  • A consultation with a doctor is needed to select the right size and type.
  • Fittings should be checked every year.
  • Additional spermicide is needed each time you have sex.
  • Must stay in place for at least six hours after sex.
  • Some people get cystitis (an inflammation of the bladder) after using the diaphragm.
  • Some people find it difficult to fit in the vagina properly or feel uncomfortable touching their genital area.
  • Spermicide can cause irritation or allergy for some people.
  • Certain creams like those used to treat thrush can damage diaphragms.

How to use the diaphragm

  • A diaphragm needs to be fitted by a trained nurse or doctor. The nurse or doctor will select the right size diaphragm for you and show you how to put it in.
  • When you first receive your diaphragm, you will be instructed to take it home and practice positioning it in your vagina. You are NOT protected during this practice period and should use an alternative contraception.
  • You will then be asked to return to the clinic/doctor’s surgery after you have fitted it yourself, so that the doctor or nurse can check you know how to put it in properly.
  • You must always use spermicide with a diaphragm.
  • To use the diaphragm, you place it over your cervix and then run your finger around the rim to ensure that the cervix is fully covered. It may sound complicated at first, but you’ll soon get the hang of it.
  • You have to keep the diaphragm in for six hours after sex and use more spermicide if you have sex again during that time.
  • Do not have a bath within six hours after putting in the diaphragm, as the water could dislodge it or wash away the spermicide.
  • The diaphragm fitting should be checked by a doctor or nurse every year.
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Published February 6th, 2013
Last updated October 29th, 2015
Tags contraception safer sex stis
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