About 5 to 8 times a week with a little bit of flux (will do it 3 times in 24 hours, then skip a day, etc), but then we are not married yet (May 2015 is the current plan).
Besides doing it for each other physically, we share complimentary kinks (I guess you'd call it that). I make it point to keep some variety injected and not always go to the most comfortable one or two positions/locations (about 60%).
We've been together for about 3.5 years now, and though the NRE / Honeymoon phase has clearly past, something special in terms of what we feel when we see each other has remained.
There has been a huge thread of consistency throughout our relationship, and unbelievable (at times) amounts of communication and discussion. Our power dynamic is clearly defined and works well, and we both can elaborate to each other on how our needs are getting met, and what we each get out of the relationship. Both of us seem to think we are getting a great deal. Transparency and boundaries are clear. Trust and respect is very high. Issues are not allowed to go unspoken. The textbook definition of the opposite of my marriage.
When I was married, it was 5-10 times a YEAR for most of the relationship, which suffer from a bad power dynamic and massive lack of respect almost from the beginning. Almost called it quits after about 6 years, but while seriously contemplating it my daughter came along, and I stuck it out for far, far too long. After I decided to D the cheating *****, I set out on a massive self-improvement quest and Alpha'd up in the ways that were honest to myself.
I mention the relationship factors because they are what I believe enables the high frequency of sex I am enjoying now to persist past the initial 6-months or so.
We both have professional careers, ex-s and non-custodial kids to distract us.