Kinsey’s work was based on a sample of around 5,000 women over a period of 10 years ending in 1949. He concluded:
(1) Men approach sex already aroused — women don’t.
(2) Most women find the genitals of both sexes ugly and are not turned on by seeing their partner nude.
(3) Most women do not orgasm every time they have ‘coitus’ (vaginal intercourse). Some women never orgasm during coitus throughout their lives.
(4) Men usually initiate heterosexual activity with a partner. Hence female masturbation is a better indicator of female sex drive.
(5) Female masturbation was used as the basis for observing female sexual arousal and orgasm.
(6) By the age of twenty over 90% of men masturbate but only 20% of women do at any one given time.
(7) Women who do masturbate, masturbate less frequently than men tend to.

These conclusions were not popular because everyone wanted to believe that the facts were otherwise whatever the evidence. So it continues today…

What is difficult to appreciate is that no one can be obliged to contribute their sexual experiences. Hence surveys will always involve people who are relatively liberated in their views and who are confident about revealing their sexual experiences to others. The population of the US at the time would have been a few 100 millions so 5,000 women is just a drop in the ocean and can never represent the whole population.