Is it permissible for a wife to slap her husband, kick him with her foot, step on him, and demand that he kiss her shoe to lick it, when he is the one who requests this before marital intimacy, and should he have informed her of these desires before marriage?

A husband's request for his wife to kiss his feet or similar actions is strange and abnormal, and it might be due to a psychological illness. He should seek treatment by consulting specialists, performing Ruqyah (Islamic exorcism), and making supplications. Kissing feet or similar actions is not prostration unless prostration and glorification are intended; if that is intended, then it is disbelief (kufr). Prostration to anyone other than Allah is forbidden and an act of disbelief. It is not permissible to obey a husband in a forbidden matter, for there is no obedience to a creature in disobedience to the Creator.