Couples, albeit of the heterosexual variety, have sex on average of four times a week before they’re married, claims Loving Link, a dating site (for married people). But when they get hitched? Three years into a marriage bedtime fun plummets to just once a week. And about half of the 3,000 couples responding to the survey say married life is like living with a friend, not a lover. So, uh, good luck Art and Jesus!