I don't know what you call average size, but the gal in that art work isn't average by todays standards. Not morbid obese, but shes defiantly fat(++size). Just because that was excepted back then don't make it right, just as too skinny is not right either today. Back then being overweight(Or what they called normal) was a sign of having money and being healthy. It meant you had enough money to stuff your self, and the poor ppl were the ones who were skinny because they didn't have any money for food and were seen as sickly. This was the ideal type and why you saw them in artwork, just as skinny ones are seen in todays magazines.
To me average would be a person who is close to what they should weight by doctors. Like if your suppose to weight 130 and your 140 or close to it, that would be average to me. Not 180lb when your only 5 foot 4. Even know i prefer my women fit and skinny, i would never not be your friend because of it. My best friend is huge and i love em like a brother.That is so wrong, i would have clobbered them.I've actually had people tell me they couldn't be my friend or go out with me because I was too fat. WHAT THE HELL???
Im not trying to be mean, but you guys do know what average is? It ain't 30-40lb overweight. Average means you close to what you should weigh for you height and body type. As long as your friend is what she should weigh and eating right, shes average technically too. The guys are attracted to her because thats what in todays society is a sign of fertility.