What to do?

So my BF and I have been together for 3 years. When it comes to sex I get really frustrated. When he wants to have sex he acts like a teenager! What I mean is he starts picking at me, play fighting, or wrestling with me. It was cute in the beginning and I have mentioned to him that I don't care for it and if he wants to have sex just say so! Now we are 3 years in and still the same thing! I've mention to him several times that when he becomes a "teenager" I'm completely turned off. Instead of changing his approach he gets upset when I won't engage him when he starts to wrestle with me. I don't reject him every time and know that once in a while is okay. But every single time he wants sex l feel like I'm in a time warp! What do I do!