Sexually transmitted diseases (STDs) are transmitted sexually by someone who is infected. These infections are usually passed by intercourse, but can also be passed through other types of sex, such as oral sex.

STDs can be caused by viruses or bacteria. If you have ever had sex, you may be at risk for having an STD. You are at higher risk if you have had many sex partners, have had sex with someone who has had many partners, or have had sex without using condoms (rubbers).

Sexually transmitted...