Joel, I think the average is probably likely to be perhaps 2-3 times per week? Thats taking into account all those people who only have it once a week and the freaks like yourself and your gf who are doing it twice a day! lol
If you're asking ME? Specifically? Every day. At least once per day. Ideally, I would be very happy to each morning and end each day, with some good love making with the man for me.
But as I have previously said, I have never ever met a man who can match my libido. Not ever. One has come pretty close...but eventually he tired out too? lol
Women can just...keep going? Men need a bit of a rest after each orgasm, usually....and that's ok. I guess it just depends how highly sexed you both are and how that chemistry you create translates into life?
Once a week, would make me very sad.
Once a month, turned me into Satan.
I made a conscious choice, to be alone and very happy. Than with someone else...and miserable.
And whilst I agree that sex is not THE most important part of a relationship - it is still important. It helps create intimacy between two people, it's an expression of love and trust and complete beautiful....surrender, to another human being? When that goes. Or is withheld...for whatever reason, the frustration that causes eventually bleeds into the other parts of a relationship....until....sometimes, there is nothing left?
Just my experience.
BUT...we're all different. I guess that's what keeps life so interesting?
And me VERY single! lol