Regular pelvic exams and safer sex practices can help keep your vagina healthy. Your vagina is just one organ that’s part of your reproductive and sexual health. What is a vagina? Your vagina is a stretchy, muscular tube that’s an important part of your reproductive anatomy. Vaginal Sex Vaginal sex involves inserting the penis inside a vagina. It is important to have sex with a condom. Having sex without one, puts you and your partner at risk of pregnancy and STIs including HIV. However, if the person living with HIV is on medication and has undetectable levels of HIV then there is no risk of passing the virus on. Condoms are the most efficient protection however, there is a possibility of sperm entering the vagina. This can occur: if the penis makes contact ... In mammals and other animals, the vagina (pl.: vaginas or vaginae) [1] is the elastic, muscular reproductive organ of the female genital tract. In humans, it extends from the vulval vestibule to the cervix (neck of the uterus). The vaginal introitus is normally partly covered by a thin layer of mucosal tissue called the hymen. A vaginal yeast infection happens when there’s an overgrowth of a type of yeast called Candida albicans in the vagina. Vaginal yeast infections are very common.