Gay and lesbian couples. The primary reason is because they take their time.
Via Bonk: The Curious Coupling of Science and Sex:
The best sex going on in Masters and Johnson’s lab was the sex being had by the committed gay and lesbian couples. Not because they were practicing special secret homosexual sex techniques, but because they “took their time.” They lost themselves—in each other, and in sex. They “tended to move slowly…and to linger at…[each] stage of stimulative response, making each step in tension increment something to be appreciated….” They teased each other “in an obvious effort to prolong the stimulatee’s high levels of sexual excitation.”
They’re also better about communicating:
The other hugely important difference Masters and Johnson found between the heterosexual and homosexual couples was that the gay couples talked far more easily, often, and openly about what they did and didn’t enjoy.
To be fair, gay and lesbian couples also have an advantage heterosexuals don’t — more familiarity with the relevant anatomy:
Masters points out that the heterosexuals were at a disadvantage, as they do not benefit from what he called “gender empathy.” Doing unto your partner as you would do unto yourself only works well when you’re gay. “Since rapid forceful stroking was the pattern of choice during male masturbation,” Masters wrote, “it was also a consistent pattern during the male’s manipulation of his female partner’s clitoris.” The lesbians’ lighter touch was “generally the more acceptable….” For no doubt similar reasons, the straight women, their husbands told the researchers, “did not grasp the shaft of the penis tightly enough.”
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