Study finds happiest people have sex once a week – and make it count

According to new research, happiness peaks when couples have sex once a week but does not increase with greater frequency - and quality matters

Sex matters to couples until it doesn't, according to new research that finds happiness peaks when couples have sex once a week but does not increase with greater frequency.

"Although more frequent sex is associated with greater happiness, this link was no longer significant at a frequency of more than once a week," said lead researcher Amy Muise.