Actually this is not an uncommon thing to believe in amongst muslims. Ask your muslim friends next time, the majority does believe that you cannot say no after marriage, I don't know how many would articulate it as Sleepy has here, but most of them do believe that if you say no you're not fulfilling your duty and that is wrong in Islam.
This is where some muslims believe it is ok to beat their wives if they say no.
http://www.youtube.com/watch?v=Zf3EdlXl4t4
This is where some muslims believe it is ok to beat their wives if they say no.
http://www.youtube.com/watch?v=Zf3EdlXl4t4