Every time you have sexual intercourse, spermicide needs to be applied to the diaphragms or cap, and then inserted into the vagina to cover the cervix. They need to be left in the vagina for at least 6 hours after sex, but can be left in longer if necessary.

They can be inserted any time before sex, however if it's more than 3 hours before sex, you must apply more spermicide.

  • You only have to use it when you have sex
  • It has no serious health risks
  • There's a choice of different types
  • It can be put in at any convenient time before sex
  • It may give some protection against cervical cancer
  • Putting it in at the time of sex can be an interruption
  • Some people find the spermicide messy
  • Some diaphragm users find they get cystitis (changing to a smaller diaphragm or cap can help)
  • Some people are sensitive to the chemicals in latex diaphragms or caps or to the spermicide
  • Oil-based lubricants such as body oils or lotions should not be used with latex diaphragms or caps

Diaphragms and caps don't suit everyone. They may not be suitable if you:

  • Have vaginal muscles that cannot hold a diaphragm
  • Have an unusual shape cervix, which means it may be in an awkward position to reach it
  • Have repeated urinary infections
  • Have had previous toxic shock syndrome

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