Researcher: Hormone to blame for ‘irritable male syndrome’: “A sex expert reckons a condition in sheep known as irritable male syndrome may also occur in humans.

He says men who see their testosterone levels drop change their behaviour, becoming more grumpy and depressed.

It was first found in male Soay sheep whose behaviour changes when their male hormone level drops each winter.

Gerald Lincoln, of the Medical Research Council’s Human Reproductive Sciences Unit in Edinburgh, says the symptoms most resemble the so-called male menopause.” Ananova