How many men/women masturbate?

The best studies of this subject are now quite old. They found approximately 95% of men and about 60% of women claim to have masturbated. There is reason to think the figures for women would be higher if another comprehensive study were done today.

This does not say how many people masturbate regularly. There are great variations in frequency of masturbation between individuals, and even for one person, the frequency of masturbation varies from time to time.

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So, to answer the question, with some very simple variables filled, and assuming that the statistics given are culturally constant...

There are 6000000000 people (given), and that 51% of the population is represented by the female gender, 49% by the male (given), and 95% of men masturbate, 60% of women (cite: Seumas). This should be sufficient to answer the question.

2940000000 x 0.95 = Number of men who masturbate = 2793000000
Over
3060000000 x 0.60 = Number of women who masturbate = 1836000000

Which, expressed as a ratio is 1.521:
1.521 men/women masturbate.
For every woman passing the finger, there is a man-and-a-half whacking off.

Alternately, one could read the question as "How many men masturbate over women?" This will require more field research, and much less theory.