It does not happen to simple people. It is for those who are ready to climb the ladder of success by offering what ever they have. So, it is a GIVE & TAKE policy. So let it continue.
this happens even all professions & not only Bollywood...it happens in corporate world too. PPl are willing to sleep with their bosses for promotions and better prospects...i see nothing wrong with it..its a give and take relation! its been happening and it will be happening as long as mankind exists