Women who have a lot of male friends and colleagues, and are seen as attractive by other males have more sex with their boyfriends, researchers have found.
Researchers say the key to the discovery was down to sexual rivalry. They studied almost 400 men in long terms relationships.
For the study, 393 men in committed, sexually active, heterosexual relationships were recruited.
Participants rated how sexually and physically attractive they found their partner, as well as how sexually and physically attractive they thought other men found their partner.
They then listed how many male friends and co-workers their partner had, before reporting how many times they'd had sex with their partner in the past week.
'A lot of work shows that men are sexually aroused by their partner when they estimate a greater likelihood of partner infidelity,' Michael Pham of Oakland University, lead author on the study, stated.
'This does not mean that men want their partner to cheat on them.
'Rather, this means that if they estimate a greater likelihood of their partner's infidelity, then they may (subconsciously) want to have sex with her to enter into sperm competition.'
The team say the behaviour is simply human nature, and males are unaware of the phenomenon, or what they are doing.
Similar patterns of behaviour have been observed in various species, from mice to birds to insects.
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