Eh, it depends. It used to be me, much more me..probably 70/30. I think it's still me, but he's also much easier to convince these days, but I also want it less these days than I used to. So he definitely initiates more than he used to, but only because I do less than I used to. If any of that makes any sense.
I answered what's sex? We only have sex maybe once a month, hubby drives truck for work, so he is usually extremely tired. He does most of the initiating, only because I want him to not feel pressured if he is too tired.