Different people like different body parts. Most straight guys will appreciate pictures of female boobs, butts, or pussies in some order of preference. His preference is apparently just tilted toward the latter. It could be that there's the most immediate association with the sex act with pussy pics. It could also be any - or any combination - of the previously suggested reasons.
"The Christian ideal has not been tried and found wanting; it has been found difficult and left untried." -G.K. Chesterton
Our society, in general, tends to view "Authority" as a necessary evil at best. We romanticize those figures who make their own way in a world where "Authority's" necessary evil is not necessary for these few, at least.
In my personal opinion, there are two people on the planet who should be able to tell you to gain or lose weight with impunity. The first one is your doctor, the second one is the person you see in the mirror.
I cannot begin to imagine the uproar that ad would cause here in the United States....
Wildest fantasy?
The Cubs winning the World Series.
Boilerplate disclaimer: I am not as shallow as the answer below may make me appear. The question posed was solely about physical appearance vis a vis attraction, so that's where my answer focuses.
The first determinant - for my tastes - between a curvy lady and being built like a truck is, well, curves. A voluptuous woman who has big breasts, big hips, yet still appears 'shapely,' has a waistline that's in obvious contrast to her bust and hips, and generally dresses to accentuate her figure is more likely to get an appreciative glance from me than one who looks and dresses as if her body resembled a refrigerator in basic shape. If a woman's figure appears 'proportionate' rather than a clearly large stomach or thighs or arms, she's less likely to get my first glance. The total package of that woman can still draw my interest, just as a stone-cold fox with the personality of catsup is unlikely to keep my attention very long.
I'd be ball-parking any sizes because of differences in height and proportion and such, but I'd say above USA size 14, a woman's starting to cross over to 'built like a truck' territory.
