Men are the first to lose interest in sex during long-term relationships, a study has found.

Men are put off of sex because they feel insecure and because they worry about losing their freedom within a relationship.

An analysis of 64 studies on sexual desire conducted since the 1950s found that men also have unrealistic expectations of their appetite and their bodies as they get older.

The study said that there are "clear assumptions in our culture that women have lower sexual desire than men" - but this isn’t always the case.

The University of Kentucky study found that unlike women, men often lose interest in sex when they are unhappy or insecure.