Another cool fact, here in Egypt 10 refers to masturbation for men and 7.5 for women !!
I don't know the exact origins of it all but I know that 7.5 refers to the shape the fingers vaguely make in arabic number system (eastern arabic numbers).
Perhaps the 10 refers to how many fingers a guy could need to masturbate, which is a very optimistic view about dick sizes I know guys in Egypt just like to do, I know this because I'm a guy from Egypt and I tell you I need only about 4 in a hot day, 3 at best in winter LoL.
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