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SUMMARY
Four groups of adult male hamsters were castrated and injected with either 6 μg oestradiol benzoate (OB), 100 μg OB, 6 μg OB plus 0·5 mg progesterone or 100 μg OB plus 0·5 mg progesterone. In repeated tests with virile males, all the injected males showed lordosis behaviour similar, but quantitatively inferior, to that of female hamsters. Uninjected controls showed no lordosis. There was no dose—response relationship between the two doses of oestrogen. Progesterone significantly facilitated the quantity and quality of lordosis behaviour shown. This is in contrast with previous reports of the absence of facilitation by progesterone in male rats. After cessation of hormone injections the animals continued to display the lordosis response for several weeks.