In the United States, estimates of lifetime same-sex behavior among women are 8%–20%, and 1.4%–4.3% of all women may be sexually active with other women. An estimated 2.3 million women describe themselves as lesbian. In its 1999 report, Lesbian Health: Current Assessment and Directions for the Future, the Institute of Medicine emphasized that more data on sexually transmitted infections (STIs), Pap smear screening, and risk for cervical cancer in lesbians were needed.<ref>[http://www.cdc.gov/ncidod/eid/vol10no11/04-0622_08.htm Lesbians and Infectious Diseases]</ref> | In the United States, estimates of lifetime same-sex behavior among women are 8%–20%, and 1.4%–4.3% of all women may be sexually active with other women. An estimated 2.3 million women describe themselves as lesbian. In its 1999 report, Lesbian Health: Current Assessment and Directions for the Future, the Institute of Medicine emphasized that more data on sexually transmitted infections (STIs), Pap smear screening, and risk for cervical cancer in lesbians were needed.<ref>[http://www.cdc.gov/ncidod/eid/vol10no11/04-0622_08.htm Lesbians and Infectious Diseases]</ref> |