orifice, porta, opening - an aperture or hole opening into a bodily cavity; "the orifice into the aorta from the lower left chamber of the heart"

urethra - duct through which urine is discharged in most mammals and which serves as the male genital duct

vagina - the lower part of the female reproductive tract; a moist canal in female mammals extending from the labia minora to the uterus; "the vagina receives the penis during coitus"; "the vagina is elastic enough to allow the passage of a fetus"