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Topics Sex Sex and intimacy: a user's guide. A lot of couples feel that it is not natural and it is forcing things, but sometimes you need to get them to become habitual so they can become spontaneous. And then there is the male erection. The cause is unknown, but there are suggestions of a link with REM rapid eye movement sleep, when people are most likely to dream. Sex can be good exercise, although that rather depends on how energetically you go at it. The best explanation of what actually happens during sex is still credited to two scientists who started work in — William Masters and Virginia Johnson — although later researchers have criticised parts of their work. Men who admittedly from their own report had more frequent orgasms had half the risk of dying over the 10 years of the study compared with those who had the least orgasms.

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