what when a child is placed on mother's chest immediately after the birth ? where does all those pain goes withing seconds?

This is a Gift of God...

I personally feel that these pains at the time of delivery are basically a love between mother and a child. That is why we see most of the children are closed to their mothers as compare to father :-)

Back to topic:

by the way we were talking about Salesmen and saleswomen selling opposite sex undergarments ;-)

I think we are discussing things according to region and culture.
According to this region and culture, they should not allow such practice.