Well I just had to look up what unguents mean
- must say it doesn't sound like an appropriate word for lotion and potions and things to me. It has a very ugly tone to my mind....
Anyhow there are a number of factors here :-
Women generally tend to have their feet more exposed than men (sandals , flip flops, peep toes etc ) and so are more conscience of how their feet look
We also decorate ours with polish / toe rings etc
Because of the wearing of high heels this places additional stress on certain areas of our feet and again make an effort to ensure that hard skin doesn't build up.
However in my experience men have also started to pay attention to this area of their bods and do regular maintainace . Both men and womens feet can look equally appalling if they are not looked after