Cary, you have to remember the situation Lara is in. She's stranded on a hostile island,mate. If any of us were shipwrecked away from civilization we'd look pretty rough and dirty too methinks. I don't know for sure, but maybe Lara finds a waterfall to "clean off" later in the game.
Personally I have a fetish for women who are not afraid too get a little roughed up. Guess that plays into my "tom-boy fetish". The females who act like they will "simply die" because they get a grass stain on their dress more or less annoy the crap out of me.
All that out of the way, I LOVE your pink dinosaur idea! I wouldn't mind having one as a side kick!