Any of various diseases transmitted by direct sexual contact that include the classic venereal diseases (eg, syphilis, gonorrhea, and chancroid) and other diseases (eg, hepatitis A, hepatitis B, giardiasis, and AIDS). Some of these diseases may also be contracted by ways other than sexual means.

• Chlamydia
• Crab lice
• Genital warts
• Gonorrhea
• Hepatitis B
• Herpes
• HIV/AIDS
• HPV
• Scabies
• Syphilis

Living with herpes: an interview with Tom

• Hepatitis A vaccine
• Hepatitis B vaccine
• Human papillomavirus vaccine

Condoms are used for birth control and/or protection from sexually transmitted infections. Learn more here.

Condoms today are a far cry from their generic predecessors—you can now choose your favorite texture, color, and even flavor. What's the best?

Learn about the dangers, symptoms, and treatment of chlamydia, gonorrhea, HIV/AIDS, syphilis, genital herpes, and venereal warts.

Gay teens, often concerned about bashing and emotional abuse, are at increased risk for physical and emotional health problems. If medical care is not user-friendly, gay teens may avoid treatment for sexually transmitted diseases. Read more here.

A common fear among people is that STIs can be passed in public places, such as through contact with toilet seats. Is this true?

• Female infertility
• Male infertility

• Herpes
• HIV