By the way, I recommend Ralph Lauren Rugby or Polo Custom Fit polos. They are nicely tapered and fit well for more muscular people. Additionally, Burberry's new summer line has tapered 3-button polo's that are nice as well (note that these are different than the traditional 2-button burberry polo and have a different plaid pattern behind the buttons). Personally, I like Lacoste too, but I have more of a "fitness model" physique as opposed to a "bodybuilder" physique. Lacoste probably will not fit that well if you are huuuge.
And as rnch said, the key word is snug, not skin tight. I promise you all the ladies will still be able to tell you have a great physique (if that is the case).