About 85 percent of men reported that their partner had an orgasm during their most recent sexual encounter, but only 64 percent of women report having had one. Researchers said the difference is too great to attribute to men having had their last encounter with another man.

Eight percent of men and 7 percent of women identify as gay, lesbian or bisexual, but a much higher percentage report engaging in sexual activity with someone of the same sex at least once. The study found that 15 percent of men aged 50-59 have received oral sex from another man at some point.

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