Exactly. Look at any painting of Venus (or any other mythically beautiful woman). Any time they weren't painting a portrait commissioned by their fat patrons, they painted women that fit the same standard of beauty that we have today, because, as much as fat people want to convince us otherwise, we've always found the same type of body beautiful, since that's hard wired in our biology. Look at this one by Velázquez from around the same period as Rubens: http://www.sauer-thompson.com/junkforcode/archives/VelazquezVenusVh.jpg