Insects and some invertebrates also have a vagina, which is the final part of the oviduct. The vagina is the female reproductive organs in mammals, as well as the penis in male mammals. Vaginal secretions variety such as sweat, sebum, and the secretion of Bartholin's and Skene's glands at the vulva, endometrial and oviductal fluids which changes with the menstrual cycle , cervical mucus, exfoliated cells, and secretions of the vaginal wall itself, which can increase sexual arousal. Structure Vagina Vagina in all women secrete pyridine, squalene, urea, acetic acid, lactic acid, complex alcohols including cholesterol , glycols including propylene glycol ketones and aldehydes.
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