How many times a month do you have sex?

Everyone one seems to go by "how many times a week" but I wonder if that's as accurate... In my case it's not because the number of times we have sex week to week varies. For example, we don't have sex when I'm on my period so that's a whole week out of every month where we don't full on do it. 
Id say we average about 10 times a month. Just curious as to how we compare (: