Intimacy and sleep are the key of happiness

To be clear - very satisfied doesn't mean these people are having loads of sex. It just means they're very happy with the quality and frequency of the sex they're having.

Increasing your household income from 12,500 pound to 50,000 pound, meanwhile, results in an increase of only two points.

The people found to be above average on the scale (between 72 and 92) were more likely to be satisfied with their sex lives and sleep than the average person.

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