My point as well. I never meant that the ships were teeming with women disguised as men; I meant, as with many things, that there were more than were documented. I don't think there were lots of disguised women at sea during the GAOP or afterwards, with the additional hardship and stress of disguising oneself added to the hardships of being a sailor, but I think it's a safe bet that a number of women were able to pull it off and were successful - meaning we wouldn't have read about them being WOMEN at sea.
In the case of Mary Read, from the accounts I read, she went undetected at first. The man she challenged was apparently unaware she was a woman - that could have prompted the story of her baring her breasts at him after she had him down and close to death.
And in terms of my own experience being a woman who has done a number of jobs that were considered masculine, I can tell you that back in the day when I cleaned sewers and storm drains (using a Vactor - you've probably seen them: large trucks with tanks on the back and hoses on the tops) oftentimes, I was mistaken for a young man, even though I was 5'4" (163 cm) tall and weighed 110 lbs (50 kg). The fact that I wore a yellow rubberized jumper and coat which disguised my figure may have been a factor, but I think a lot of it was that people were just expecting me to be a man.