Ugh, i'm 20, my gf is almost 35, we have been going out for almost a year. We only have sex when she wants to, I stopped even asking. Lately, it's better than before. Whenever we see each other, and if we have a place to do it, we will. A little while ago it was once a month, then once a week or so, but the last week maybe 5times.
This last week was more since my parents were out for the week and my gf was staying at my house. It was sorta like a vacation for her, and we had a lot of fun. Aside from this week, it's 1-2times a week. It might change when I start seeing her more often when I move back to college.
-sk