New work by Daniel Kahneman, Alan Krueger, David Schkade, Norbert Schwarz and Arthur Stone (Kahneman et al 2003) finds, among a sample of 1000 employed women, that sex is rated retrospectively as the activity that produces the single largest amount of happiness. Commuting to and from work produces the lowest levels of happiness. These two activities come top and bottom, respectively, of a list of 19 activities.
Source: “Money, Sex and Happiness: An Empirical Study” (referencing “Measuring the Quality of Experience”, Princeton University, 2003)
For more on the unhappiness in commuting, check out: Everybody hates commuting. Why do we do it?