I have heard this discussed time and time again. I have had the discussion time and time again.
And ultimately I find the same thing both men and women ultimately like who they like regardless of the physique.
Although I feel in shape and with muscle has an edge. Never knew anyone in shape who didn't have a significant other or several for that matter.
I have known and dated women who have said I think the whole bodybuilding thing is ugly its to much.
I have known women who laugh and dis smaller underdeveloped guys in favor of the muscled jock.
I have known women who have laughed in the face of Hercules Incarnate and gone after and married the skinny guy at the gas station.
I have known both men and women who constantly have talked about belittled and insulted obese people then wound up married or dating the proverbial fat dude/ or fat chick.
I have seen people belittle the hadicapped but fall in love with someone in a wheel chair.
So while I beleive people have parameters for what they find attractive they often change their veiw when the variables come into play.
I question sometimes though if they are being true in the first place.
I am sure sometimes its the curiosity factor IE I wander what he/she is like in bed or something to that affect but very often these relationships last quite a while if not forever.
Having said that In general I just don't think its that easy to judge what people like for the reason that no one ever winds up with any one who isn't attracted to them. (Not counting those that are getting used of course)