Researchers at the University of Oxford and Northumbria University have found that you can predict the likelihood of whether a guy will cheat by the length of his ring finger.

Men whose ring finger and index finger are the same length are more likely to be faithful partners, whereas those with a longer ring finger are more likely to cheat.

The researchers have suggested that men who’ve been exposed to high levels of testosterone in the womb (testosterone is linked to the sex drive) tend to have a long ring finger. The more testosterone a person has, the higher the sex drive, as well as the inclination to take risks.

We must stress that this is not an accurate prediction that your partner will cheat, it does help identify the types of people who are more likely to be risk-takers and promiscuous.