Should there be a pregnancy clause for actresses?

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The news of Aishwarya Rai Bachchan getting pregnant has sparked off a completely new debate in the tinsel town – should there be a pregnancy clause for actresses? This is really a debate worth taking up. Most logically, the clause should exist as the director and the producer get an idea of the time they have on their hands.
However, Beauty Queen Sushmita Sen and director Ram Gopal Varma