Why people like to lick male feet?

Licking Feet is an Fetish (aka paraphilia) which can happen to anyone. Generally, an Fetish can happen to any Gender (lesbian foot licker, gay foot licker, bi-sexual Foot licker etc.). To lick Male feet also is Bi-Sexual Foot fetish or Gay foot fetish.

Well, there also women where lick mens feet, it´s also an symbol for respect and domination. google Foot fetishism.