We've been married for a long time. I'd say similarly to what Alicia said, it has varied, depending on children, babies, illness, etc. But, in the long run, we have more sex than before we were married, because we are together more. I lived with him part time for about a year or two before we got married (I was still in college for half that) but, we still spent most weekdays in our own places.
I moved in with him full time only a few months before we got married, and of course, being together all the time, the sex increased. I found out I was pregnant the first weekend in our first own house, so we didn't have much of a honeymoon period. We have kids from their 20s down to grammar school age. But, no more babies, so the frequency is pretty high.