“… researchers have found that sex once a week is the optimum amount for maximizing happiness. Couples having sex more than once a week do not report being any happier, according to a new study published in Social Psychological and Personality Science, but couples having it less than once a week report being less happy.”
The best recipe for healthy sex life - stop overeating.
You are allowed to gorge yourself on the first date as a part of established mating ritual: No dinner, no sex. Great dinner, great sex.
Great? What's so great about bloating, flatulence, gripes, and other symptoms of overeating? Of course, both partners are usually aroused enough to disregard these 'minor' inconveniences on the first few dates.
Later, when the novelty of sex gradually dissipates, the symptoms of indigestion overpower sexual drive. And that's when the populace becomes happy to have sex once a week.
As I said, the solution is easy - eat in moderation.
Less food - more sex for healthy, happy people!