I haven't watched the show, but I've seen Dunham and Allison Williams on the late night talk shows. The only things I could piece together from that and a quick Google search is that the fat girl gets naked every episode and the hot girl refuses to get naked ever.
"The trouble with being a ghost writer or artist is that you must remain anonymous without credit.
If one wants the credit, one has to cease being a ghost and become a leader or innovator." — Bob Kane