This is the number of times couples need to have sex weekly

Researchers have outlined the number of times couples should get down in a week and it's Once a week. Lead author Amy Muise, Ph.D., a psychology professor at York University in Toronto told Daily News

“Once a week seemed to be the sweet spot,” Having sex more often than once a week doesn’t make the average couple any happier. On the other hand, it doesn’t make them any less happy,.

And even though you might imagine that men disagree with once-a-week in a big way, think again. Results were the same for men and women, for young and elderly, and for longtime and short-term relationships.
Another finding: Muise told the Daily News that “couples having sex less frequently than once a week were less happy than those having sex once a week.”