When heterosexual men were given oxytocin or a placebo prior to meeting an attractive woman, the oxytocin had no effect on single men, but it caused those in a monogamous relationship to stand farther away.

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Quizplus · Accepted Answer

This is supported by a study conducted by Schneiderman et al. (2012), which found that oxytocin had no effect on single men but caused men in committed relationships to increase their distance from an attractive woman.

When Heterosexual Men Were Given Oxytocin or a Placebo Prior