Too many men with women avatars here.

[Maxpphire]

not that you can tell from any of the oblique angles
and not that digit ratio is 100% accurate

but sure let's go with that

Well the sailor one kinda shows it.
Basically if you are a girl your index finger will naturally be longer then your ring finger and vise versa for males.
However some people do have both the fingers be the same height.