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Since according to S. culture, it's very dangerous for men to have sex with a women (though they believe it is sexually pleasurable) -- since it's dangerous and they also believe that a man must have penis-in-vagina sex many times with his wife to make a baby -- these two things contributes to the notion -- discussed at length in your reading ‚ that the S. see some sex as "work" [sex like this] and some as "play" [examples to follow].