Question

A gents does once in a life time and ladies do it daily. What is it?

Answer 1

putting vermillion/sindoor on the forehead. A man does it only during his marriage.He puts sindoor/vermillion on his wife's forehead. But a woman does it daily

Answer 2

putting sindoor in head
men do in his marriage putting the sindoor in his wife's head 
but woman daily put sindoor in her head