The following glossary is adapted from the glossary provided by Planned Parenthood at https://www.plannedparenthood.org/learn/glossary.
Immune system: The body’s natural protection against infection and disease. The virus HIV attacks the immune system.
Implanon: The brand name of a contraceptive implant.
Implant: A thin, flexible plastic implant about the size of a cardboard matchstick. It is inserted under the skin of the upper arm. It releases a progestin that prevents ovulation and fertilization. Can be used for up to three years to prevent pregnancy. The implant is a reversible hormonal method of birth control available only by prescription. Implanon is the brand name of the implant.
Implantation: The attachment of the pre-embryo to the lining of the uterus, which begins about six days after fertilization and is complete in three to four days. The beginning of pregnancy.
Impotence: The inability to have an erection. ”Erectile dysfunction” is now the preferred term.
Inner lips: The labia of the vulva that surround the clitoris and the openings to the urethra and vagina. Also called “labia minora.”
Intercourse: Sex play in which the penis is inserted into the vagina (vaginal intercourse) or the anus (anal intercourse).
Internal sex and reproductive organs: The organs inside the body that are responsible for producing, moving, and nourishing human reproductive cells. Internal reproductive organs that are sensitive or respond to sexual stimulation are also called sex organs.
Intrauterine device or IUD: A small device made of plastic, which may contain copper or a natural hormone, that is inserted into the uterus by a health care provider to prevent pregnancy. A reversible method of birth control available only by prescription.
Intrauterine system or IUS: A small IUD made of plastic, which contains the hormone progestin, that is inserted into the uterus by a health care provider to prevent pregnancy. A reversible method of birth control available only by prescription. The brand name of the IUS is Mirena.
Introitus: The tissue of the inner vulva that frames the opening to the vagina.
IUD: See intrauterine device.
IUS: See intrauterine system.
Jock itch: A very common fungal skin infection in the genital area of men that is caused by wearing tight clothing, sweating, or not drying the genitals carefully after bathing. It can cause a reddish, scaly rash that can become inflamed, very itchy, and painful.