Well, maybe it will
Because you think of fears like this they might actually happen because you're imagining it yourself, you're actively thinking about your fear and then it manifests itself.
A while back someone posted a similair story about how he remembered thinking 'oh no now this girl that i'm gonna kiss is gonna turn into that girl from the excorsist' because he was afraid it might happen. Because he thought that, it happened. So what you have to do is rationalise it and think about the beautifull woman instead of saggy boobs.