I've never heard of anyone having such problems with saddles. I ride 12,000/year and I use the same saddle whatever the weather. No pains, no saddle sores, and no problems. I prefer a Fizik Arione, but that's just me.

I would say i don't know.
What i know to have experienced it is the opposite to Sheldon Brown's citation in the previous posts: my summer saddle that i chose on purpose with the widest nose possible without generating chaffing is very comfy during summer but doesn't fit well in winter when i have to add layers. So that i switch to my winter saddle when winter comes. The extra layers that come with winter on my summer saddle generate the same feeling than having thick misplaced seams.

So your answer is that they do not create a problem as long as the saddle nose is narrow enough? Good to know.

I still think there is far more to it than the nose width. The "sitting area" toward the rear can take any shape from convex, to flat, to channelled, in an effort to please every person out there. I tried a Brooks Pro last year, and just couldn't get along with the rounded top despite the fact that the width of the nose and rear sections were perfect for me -- I switched to narrower B17Ns and B5Ns, and the flatter top agrees much more with my perineum. Perhaps what erig007 is getting with saddles that have a maximum nose width are saddles with the right amount of width in the rear to support his sitbones.

I dug through the sq-lab collection of abstracts, and found it interesting (but not surprising) that many of them contradict. The natural tendency in that situation is to favor any that bolster your worldview. I was able to come away satisfied that if my saddle doesn't cause numbness or pain, and that I rose off the saddle occasionally while riding, that I shouldn't have any significant or long-lasting problems. Cool.

I knew what you meant. I speak french too but my french spelling would be lacking if you saw it. LOL
Being raised in a French Acadian environment helped me understand your point. Anyway, the theory of a shorter nose is correct for winter riding when you could possibly be wearing at least a thicker layer. It is not common knowledge so most would just discount that and it's understandable but you are right and the explanation you provided from those studies are good to know stuff. The Brooks B17S is a good choice for winter riding because it has a shorter nose and is designed primarily for women but it's very comfy for men too. I also have a "Ride Out Carbon Comfort" saddle that has a very short nose and is great for winter and year round really.