Latest Headlines
AIDS Virus in Cats Might Help Human Vaccine Effort, Study Hints
Protein in feline virus triggered immune reaction in blood from people with HIV
Protein in feline virus triggered immune reaction in blood from people with HIV
Top Stories
Health Insurance in Your State
Learn about plans, benefits, and costs in your state's Marketplace.
WebMD Sexual Conditions & STDs Community
Community. Experts. Support.
Top Search Terms for Sexual Conditions
Your Guide to Sexually Transmitted Diseases
Sexually transmitted diseases, commonly called STDs, are diseases that are spread by having sex with someone who has an STD. You can get a sexually transmitted disease from sexual activity that involves the mouth, anus, vagina, or penis.
According to the American Social Health Organization, one out of four teens in the United States becomes infected with an STD each year and by the age of 25, half of all sexually active young adults will get an STD.