If you are a male and lack the ability to attract females, then simply get a happy-looking woman to accompany you, for a new study has found that men in the company of smiling women are likely to catch the fancy of other females.
However, the study also suggests that other men may view them as a threat.
According to psychologists, the copycat behaviour among women is because they do not have confidence in their own judgment.
"If a female has difficulty choosing the best male, she can help herself by seeing how rivals behave," the Mirror quoted Dr Benedict Jones, of Aberdeen University, as saying.
In the study, female volunteers aged about 24 rated pictures of young men's faces.
When they were shown a man next to a smiling woman, they upped their score by at least 15 per cent.
According to the paper, though such a phenomenon has already been seen among fish and birds, this research is the first evidence of such behaviour in humans.
The study has been published in the Biological Sciences journal.