Mr Arsenault, from Fremont California, has a strict regime involving ‘fertility smoothies’ made of berries and nuts, regular exercise and wearing loose clothing, meaning his sperm is four times as powerful as the average man’s.

He told The Sun: ‘I used to long to have a wife and children of my own. But the more I donate, the less I feel that need. So I decided not to fall in love or have children as that would restrict my ability to be a donor.

‘I still refuse to have sex because I don’t want to risk catching a sexually transmitted disease. If I caught an STD that would be the end of my days as a donor.’