I think this is something that everyone has experienced in one form or another. Even if you are as straight as they come, the world around you still dissects and labels all or your partners and sexual experiences and turns it into this tidy little label that becomes part of who you are as a person. I can't tell you how many people I know who think of their sexuality as the main aspect of their personality. And while I wouldn't say that is necessarily wrong, it does seems kind of limiting.
We're all so much more than who we sleep with.