Go ahead, sex marathoners! Long sex exists only in your imagination, in movies and only in absolutely unoccupied childless youth. Normally working people cannot physically endure. And a dumb man can not and does not want at all, and temperament is not about it. What kind of clock? Clock removed from sleep. You have rattled. Sleep is more important. Also tell, that women with small children dream of a long sex...dreams, they are dreams, and you can only sketch a day for fun on a vacation without children, which for many is simply unrealistic. True 2-3 times a week for 15-20 minutes and then happiness. And by the age of 40 - honest 1-2 times a month.