There is a truth in what has been mentioned though
Kissing your child means you showing love and they also understand that it is a norm in other area of the world. Thats exposure to them
So I think the point is if one can give to his or her child that level of exposure then like @Darryice said he or she should also be prepared to give the child a very sound sex education. If not then kissing ones child should be regarded as not safe
I wish more topics like this could come up, loving it.
There are things I wish my parents had sat me down to tell me but I do thank jah for the man I have become and my parents for the little they could do