any proper terminology of human genitalia. A nice little trick you can try if you don't mind being stared at, next time using some sort of public transit say the word "vagina" out loud at a resonable tone (not yelling), and you will notice a change in the people around you. conversations will stop things will get a little quieter, and yes people will be looking at you. I did it on a bus one time, very similar effects of saying fire, just without the rushing to the nearest exit.