I understood you weren't interested, but because you want to improve it, he needs to think you are and eventually you will be...hopefully. I would be willing to bet trying sexy surprises, not adventurous, would be to his taste and start that spark of interest back up. nothing big, just your initiation physical contact leading into it, or more passionate kisses for a few days followed by being in a "modest" negligee. if that goes well, you can keep upping it until it is carefree, sexy, romantic, and fun. You may find love again. I don't know any man who actually thinks anything other than missionary with the lights off too adventurous or disgusting.