Via Justin J Lehmiller we have this chart on the frequency of intercourse in married couples:

Jo and I are in our 50’s and sometimes have sex as often as four times in one day! Yet having sex four or more times in one week would put us in the top 1.1%.

We were shocked. Jo said, “What are these people doing?!” My response was, “I don’t know. But we know what they aren’t doing.”