I would say nurture mostly because I love scents nowadays that had put me in a state of euphoria when I was kid. *For example: *My buddy next door to me had an older sister who would come over once in a while and she would wear this perfume that smelled like a rose, nothing too fancy or expensive but just a straight forward rose scent. *Well as you can imagine those boyhood fantasies get intermingled with the olfactory memories and Blammo! you got a rose frag junkie.
As far as the MHC genes, that stuff sounds a little too much like naturopathic research and probably not taken seriously. *Although there could be some truth to it, but I think there are way more important factors in choosing mates other than white blood cells that we consciously implement or even sub-consciously.
Also differing alleles don't necessarily mean the offspring will have both varieties. *There are many different ways of developing genetic mutations. *Also if the other person has deficiencies (albeit different) in their MHC, wouldn't that be a "bad" choice for evolution of the genes? *
The "lets try and sound overly scientific" article was definitely not written by anyone with a solid science background because one of the first things you learn in writing a scientific article or paper is to define your terms and give the reader something interesting to read. *The other article is obviously only for entertaining reading only.
Oh yeah some more supporting evidence for nurture.
Do you still like the scent of an ex-psycho? I didn't think so
Olfactory sensations are closely connected to memories and memories are based upon outside forces i.e. nurture.