Topic: Inconsistent sex tagging system

just wondering but is there any good reason why proper names are used for male genitalia and non-sexual bodyparts and orifices but slang used for female genitalia?
I see that the proper names for female genitalia do exist but are presently aliased to slang words rather then the other way around...

This kinda in light to derogatory describers also used specificly for intersex sub groups

Updated by Sorrowless