"Happiness is found by living in the now, particularly if the now involves having sex, according to a major study into mental wellbeing.
But the study also found that people spend nearly half their time (46.7%) thinking about something other than what they are actually doing.
The benefits of living in the moment are extolled by many philosophical and religious traditions, but until now there has been scant scientific evidence to support the advice.
Psychologists at Harvard University collected information on the daily activities, thoughts and feelings of 2,250 volunteers to find out how often they were focused on what they were doing, and what made them most happy.
They found that people were happiest when having sex, exercising or in conversation, and least happy when working, resting or using a home computer. And although subjects' minds were wandering nearly half of the time, this consistently made them less happy.
The team conclude that reminiscing, thinking ahead or daydreaming tends to make people more miserable, even when they are thinking about something pleasant.
Even the most engaging tasks failed to hold people's full attention. Volunteers admitted to thinking about something else at least 30% of the time while performing these tasks, except when they were having sex, when people typically had their mind on the job around 90% of the time."
This couple is probably happy: