but of me and some others in a sex-less marriage, it is how many times of sex per month?
how about once or twice per month with my ATF.
thankful for at least that.

Tri-weekly, Try weekly, and Try weakly

Or as the story goes, an eighty year old is attending a lecture of sexual behavior and learns that a person at his age is likely to have sex only once a year.  The lecturer sees the eighty year old smiling and asks him, why he is smiling if he only has sex once a year.  He replies "tonight is the night"

Now, I'm in at the average 0-2 times per week. In my very long married life it averaged about 1/week. There were times when we were apart for up to a month but we made up for lost times when we were both home again.

Oops.

It's sort of a confusing question in the first place.