I think that it lent purpose in the story, and I truly asked myself that question, because I wouldn't want to do it if it was gratuitous.
You know, it's just a boob.
However, if you want to see Katee Sackhoff naked or topless, then this blog post is where you should be! How often do you see your friends? You can find out if she has ever been naked or not! You should put a very high bounty on them.