I think this was just a general study. And NOT necessarily saying that it is absolutely impossible that there cannot be more to a relationship than what was pointed out. I believe foot attraction can play a very significant role in how one individual views another. There is no doubt in mind that foot fetishism in some form, is here to stay and will forever be a part of the fabric of society in some fashion for both genders. Typically not the main attraction but conceivably very powerful to a certain segment of people nonetheless. For example, from a heterosexual male's perspective, if a woman is beautiful externally (inside as well) and also has beautiful feet, that sort of seals the deal and is the "icing on the cake", isn't it?
And having said that, it might not be such a bad idea to lick the icing off the foot, errr, cake