Fetal fibronectin protein or its assay from vaginal secretion to assess risk of premature delivery
Ernst Gräfenberg was famous for his studies of female genitalia and human female sexual physiology; he published, among other studies, the seminal The Role of Urethra in Female Orgasm (1950), which describes female ejaculation, as well as an erogenous zone where the urethra is closest to the vaginal wall.
Later research work included contributions on oral, parenteral, buccal, and vaginal drug delivery systems and mechanisms, with a strong emphasis on bioadhesion as a control phenomenon.
The Abrahamic religions of Judaism, Christianity and Islam, have traditionally forbidden non-heterosexual and non-vaginal sexual intercourse (both of which have been variously labeled as sodomy), believing and teaching that such behavior is sinful and derived from the behavior of the residents of Sodom and Gomorrah.
Pioneering researchers studied the male and female genitals during coitus (penile-vaginal penetration) with ultrasound technology in 1992 and magnetic resonance imaging (MRI) in 1999, mapping the anatomy of the activity and taking images illustrating the fit of male and female genitals.
A number of vaginal, anal, and vulval swabs were taken by the pathologist, and subsequent forensic examination confirmed the presence of semen, from which the blood type of the killer was determined.
A study in the BMJ, with over 1.6 million women, found that users of vaginal rings with ethinyl estradiol and etonogestrel have a 6.5 times increased risk of venous thrombosis compared to non-users.
The Myth of the Vaginal Orgasm is a classic feminist work on women's sexuality, written by Anne Koedt, an American feminist, in 1968.
Total Vaginal Hysterectomy, a surgical removal of the womb through the vagina