..the other 16 % are liar...
I never had a girl or woman who doesn't do it... I think girls who masturbate know how to do sex very well...
Here are some examples from my wife - she loves to masturbate alone, before me - sometimes before very good friends...
First time she does, she told me she was 8 years old. At this pics she was a twen... Today she is in the mid of 50 and does it nearly every day... Love it to see her doing!