Could this worry be clouding your judgement? I know it did for me. I had this happen to me with a girlfriend too. I am not saying this applied to you but now I just realize I was thinking about guy's asses. Again this might not apply to you but I tried some experiences when I was drunk and chickened/freaked out - I was too much in denial. For a long time I believed I was not attracted to men in person and for the most part I am not - but the more I accepted myself the more I 'allowed' myself to look, I have discovered I am -I realized that I was actively suppressing this out of guilt and worry -worry for example that people might realize I am checking out a guy.