Genetically, it's "harder" to have a male because of X and Y chromosomes.
XX is women, XY is men. Usually, during sex, the sperm and the egg is XX but once the girl has an orgasm, the acid changes one of the chromosomes to an Y. Orgasm = Male...
Considering that, there is going to be more female than men. Because of the genetic rarity, the male were more important than women. To make more male, they had women stay virgins until they were going to have a baby. They also created Karma Sutra and other sex techniques to help them have more male.
Men were rare back then. Come to think of it, I guess most of us now are better in bed than guys 300-400 years ago.
Funny thing is that back in the Renaissance, when the Prince and the Princess first have sex, they have old folks telling the prince how to perform in bed.
Weird if you think about it...
Your uncle says, "Prince, twist your hips 5 degree NW!"
Your aunt says, "Stroke faster!"
Your father says, "Arch your back!"
Your friend says, "Let me join!!!"
History is weird...