The director is currently filming Matru Ki Bijlee Ka Mandola with Imran Khan.
He told The Times of India: "All the male stars I worked with had a problem barring Ajay Devgn, who was a cool guy. If you ask a guy to take off his shirt, his face drops as he has not exercised and is more concerned about his cuts, curves and muscles than girls who are more relaxed on this count.
"Guys are also more complexed than the girls. There was a scene in Omkara as per the script where the actors were to sit with their upper bodies bare while the hawan was being carried out. When I saw Saif he was all ready with his cuts and curves and looked bulgy straight out from a gym as against looking like a villager.
"One of the actors told me, 'You should have had the courtesy to at least tell us that you wanted us to wear gamchas during the hawan so that we would not have killed ourselves in the gym'. I felt bad and allowed them to sit bare body in the shot.
"Thereafter, in every film, I have fun when I tell an actor that you have to go bare body. He immediately goes into depression and starts going to the gym and asks for at least 21 days to get ready which I find amusing. Girls are lovely and painless. I wish I could make more female-oriented films."
In October, Khan revealed that he had almost dropped out because the preparation for his Matru Ki Bijlee Ka Mandola role was so tough.
He spent five hours a day learning the Haryanvi dialect in order to play a country boy who falls in love with a city girl.