I felt the same towards my ex. What sucked was he never felt the same way (well, in the very beginning he did, before all his insecurities came pouring out). I always wondered if it was me, but he would always lovingly reassure me that it was just the way he is. I was halfway to running around 24/7 in panties and a pair of stilettos just to get his attention sometimes! He only got really frisky if his inhibitions were lowered enough after a few drinks, otherwise he was pretty uptight about sex (pretty uptight in comparison to me anyway). It always felt like being intimate had to be this big production instead of a fun, carefree way to appreciate each other. Getting turned down got old really fast and then got depressing and upsetting. He's the only guy I met that didn't have a libido to match my own.