I don't know if Flo from the Progressive commercials is the best example. She's played by an attractive woman, but they make her up to look rather strange. But the general point of using attractive people to sell products, I agree with.
Erotica is nothing new. Fanny Hill was published in 1748. The content hasn't gotten more extreme, it's just that it is more widely available. Back in the 70's, there were these "true confession" type tabloids marketed at women. Some were extremely tame, the content of others was comparable as the letters in Penthouse.