Men paradoxically damage their ability to have children during efforts to make themselves look more attractive.

Scientists have uncovered an evolutionary paradox where men damage their ability to have children during efforts to make themselves look more attractive.

Taking steroids to get a buff physique or anti-baldness pills to keep a full head of hair can damage fertility.

It has been named the Mossman-Pacey paradox after the scientists who first described it.

They say it causes a lot of heartache in couples struggling to conceive.

“I noticed some men coming in to have their fertility tested and these guys were huge,” says Dr James Mossman, now at Brown University in the United States.

He was studying for his doctorate in Sheffield when he made the connection with steroid abuse.

He told the BBC: “They are trying to look really big, to look like the pinnacles of evolution.

“But they are making themselves very unfit in an evolutionary sense, because without exception they had no sperm in their ejaculate at all.”……

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