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The opening of the vagina lies in the urogenital triangle.The urogenital triangle is the front triangle of the perineum and also consists of the urethral opening and associated parts of the external genitalia.

Because of the presence of the cervix in the front wall of the vagina, there is a difference in length between the front wall, approximately 7.5 cm (2.5 to 3 in) long, and the back wall, approximately 9 cm (3.5 in) long.During sexual arousal, the vagina expands both in length and width.In amphibians, birds, reptiles and monotremes, the cloaca is the single external opening for the gastrointestinal tract, the urinary, and reproductive tracts.To accommodate smoother penetration of the vagina during sexual intercourse or other sexual activity, vaginal moisture increases during sexual arousal in human females and other female mammals.Although research on the vagina is especially lacking for different animals, its location, structure and size is documented as varying among species.

Female mammals usually have two external openings in the vulva, the urethral opening for the urinary tract and the vaginal opening for the genital tract.Otherwise, being very elastic, it may return to its normal position.Additionally, the hymen may be lacerated by disease, injury, medical examination, masturbation or physical exercise.By its dictionary and anatomical definitions, however, vagina refers exclusively to the specific internal structure, and understanding the distinction can improve knowledge of the female genitalia and aid in healthcare communication.Although by its dictionary and anatomical definitions, the term vagina refers exclusively to the specific internal structure, it is colloquially used to refer to the vulva or to both the vagina and vulva.In mammals, the vagina is the elastic, muscular part of the female genital tract.