The contraceptive cap is a circular dome made of thin soft silicone and is inserted into the vagina before sexual activity occurs. It prevents sperms from reaching the uterus. Spermicide is used along with it to kill the sperm. The cap is left in place for six hours after sex and then taken out and washed. The caps come in different sizes and a person needs to get fitted for a correct size by a doctor or trained health specialist. They are also reusable. However it is important to note that a cap only provides limited protection against STIs. It is also more effective for women who have never given birth.

 Cervical cap

A collection of cervical caps

 

Inserting a cap

Caps come with instructions.
• With clean hands fill one third of the cap with Spermicide. While doing this avoid putting Spermicide around the rim as this will stop the cap from staying in place
• Squeeze the sides of the cap together and hold it between your thumb and first two fingers
• Slide the cap into your vagina upwards
• It is removed by hooking your fingers under its rim, loop or strap and pulling it downwards and out
• After use the cap is washed with warm water and mild unperfumed soap
• Always check your cap for signs of damage.
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Inserting using one finger
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Inserting using two fingers
http://www.doctorabel.us/contraception/the-cervical-cap.html
Advantages
• You only need to use it when you want to have sex
• You can put it in a convenient time before sex
• There are no serious side effects
• It can be carried in your pocket or purse
• Generally it can not be felt by you or your partner
• It has no effects on a woman's natural hormones
Disadvantages
• Not as effective as other types of contraceptives
• Provides limited protection against STIs
• Takes time to learn how to use a cap
• Cystitis-bladder infection can be a problem for some women using a cap
• Latex and Spermicide can cause irritation in some women and their partners.
• It can not be used during menstruation
• May be difficult for some women to insert
• May be pushed out of place by some penis size, heavy thrusting or certain sexual positions
• After pregnancy may need to be replaced by a larger sized cap
References
Contraception guide. NHS. GOV.UK. Removed from: http://www.nhs.uk/conditions/contraception-guide/pages/contraceptive-cap.aspx
Cervical Cap (Fem Cap) c 2014 Planned Parenthood Federation of America Inc. Removed from: https://www.plannedparenthood.org/learn/birth-control/cervical-cap
Choosing a Birth Control Method (2014 June) Association of Reproductive Health Professionals. Removed from: https://www.arhp.org/Publications-and-Resources/Quick-Reference-Guide-for-Clinicians/choosing/Cervical-Cap
Cervical cap. c 2015 The Nemours Foundation. Retrieved from: from: http://kidshealth.org/teen/sexual_health/contraception/contraception_cap.html
Cervical cap. c 2015 Centre for Young Women's Health, Boston Children's Hospital. Removed from: http://youngwomenshealth.org/2011/06/01/cervical-cap/