And one thing that I find interesting is that women are never neutral about having me touch their feet.  They either love it and insist on it (the majority, thankfully) or don't allow it at all as it is too "personal" or "sensitive".

I find as much pleasure in having them ooh and aah while I rub their feet as in the touching itself.

Meeting a gal who is an artist at giving a foot-job is the greatest thrill of all.

Personally it does not matter what particulr physiological or psychological processes created this desire.  I'm just so glad it is.