What two things can you find surrounded by someone's mouth to make clear to his/her sex?

What two things can you find surrounded by someone's mouth to make clear to his/her sex?
Cells that you can use for chromosome testing
Alternatives are not necessarily as accurate.
cavity and straightness
Lies - male
chocolate - woman
LOL
you entail to look in the person's pant -not the mouth. a male have a ***. a woman does not.

need girl names with meanings