We include products we think are useful for our readers. If you buy through links on this page, we may earn a small commission. The term sexually transmitted disease STD is used to refer to a condition passed from one person to another through sexual contact. Depending on the specific STD, infections may also be transmitted through sharing needles and breastfeeding. But some STDs cause obvious symptoms.

We include products we think are useful for our readers. If you buy through links on this page, we may earn a small commission. Sexually transmitted infections STIs usually pass from one person to another through sexual contact. Most are fairly common, and effective treatment is available — especially in the early stages.

Oral sex involves using the mouth, lips, or tongue to stimulate the penis fellatio , vagina cunnilingus , or anus anilingus of a sex partner. The penis and testicles and the vagina and area around the vagina are also called the genitals or genital area. Oral sex is commonly practiced by sexually-active adults. Many STDs, as well as other infections, can be spread through oral sex. Anyone exposed to an infected partner can get an STD in the mouth, throat, genitals, or rectum.