Exactly.  Given what we know about obesity, thin couples who fuck together are clearly more likely to have a happy marriage.  Someone on Reddit said "sex is relationship glue."  If physical intimacy weren't crucial to marital health, there'd be no market for Viagra.  The husbands wouldn't care.  See also: /r/DeadBedrooms. On a related note, guess what skyrocketing obesity and diabetes rates mean for erectile dysfunction, endocrine health (which affects sex drive), and even the basic cardio ability necessary for sex? On a related note, fat lesbians on a Buzzfeed video sincerely believed tribadism/scissoring wasn't real and was just a fiction invented by porn, because they weren't capable of it.