Because you will so regret not kissing your mother![]()
Of course you will, it's a sign that you love your mum, you will always regret never showing your parents how much you love them once they've are gone, even if you tell them every day, there is/was always something more you could do.
It's a kiss on the cheek, it's not like you are sticking your tongue in her mouth or honking her boobs!