Sperm also knows sniffing

Like a guy turning his head to inhale the scent of a beautiful person, sperm cells also turn their heads when they discover the faint scent of a sexy egg.

Research in the United States has identified some sperm cells that can detect the scent of eggs even when that smell fades away 100,000 times.

" Sperm has the same characteristics as the human nose ," said Milos Novotny, a professor of chemistry at Bloomington University in Indiana.

Sperm cells possess olfactory proteins, similar to the receptors in the nose. They are located right above the sperm membrane and signal the proteins inside to transmit information.

" Where sperm cells need to make that smell of seductive chemicals and redirect their actions to that side. They have an early recognition system, unlike some other bacteria, " Novotny said.

Novotny and his team studied mouse sperm with a device that injects fluid containing eggs' chemicals into test tubes and filmed sperm's sperm. They found a lot of sperm detected chemicals and turned towards it.

The team still does not know which chemicals in the eggs attract sperm, but they believe that these chemicals are common in all mammals. So the results can be applied to people.

In another study at the University of California, USA, researchers also found reduced sperm quality along with the older age of men. That shows that men and women have biological clocks, though slightly different. Men will lose their reproductive ability gradually, not abruptly like women.