"In 75% of the cases the men report always having an orgasm. With women only 26% say they always have one, although 45% of men believe their partners always have an orgasm."
However, where the two sexes experienced greater equality - essentially in western countries - 60 to 80% of subjects said they had good sex.
Couples in Austria topped the good sex league with 80% of men and 63% of women saying they were enjoying extremely or very satisfying sex.
In second place came Spain, where 73% of men and 68% of women reported high satisfaction rates, the study suggested.
But in "male-centred sexual regimes" like the Middle East, Brazil, Italy and parts of Asia the study suggested satisfaction rates fell to the 40-50% range.
More at the BBC.