If you thought that love or lust were the only reasons that people have sex, you'll be surprised at the findings of a new study.
According to the largest ever study carried out into sexual motivations, psychologists have identified 237 different reasons why people choose to have sex.
Among some of the more peculiar answers, some said they had sex because they thought it would help them to fall asleep more quickly, while others said that it seemed like good exercise.
In a huge blow to the ego, it seems that boredom is a key factor in influencing people's decision to have sex, as is the desire for revenge.
More than 2,000 men and women aged between 17 and 52 were quizzed for the study by psychologists at the University of Texas.
Researcher Cindy Meston said: "We identified 237 distinct reasons why people have sex. They ranged from the mundane 'It feels good' to the spiritual 'I wanted to feel closer to God'.
"From altruistic 'I wanted the other person to feel good' to manipulative 'I wanted to get a promotion'."
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