Although I love a beautiful female as much as the next guy, probably more.....I can see where sigs should be pg. Most posts that have NSFW stuff are labeled as such so you can decide to click it or not, whatever your reason for not is. With an R sig, EVERY post becomes NSFW and that's not cool....

You want to see titties, make your own NSFW post or quit being cheap and join a porno site!!