Pandu was the father of the Pandavas in the Mahabharata. Story of the curse on Pandu in the Mahabharata is found in the Adi Parva of the Mahabharat. During a hunting expedition, Pandu struck an antelope with his arrow.
He had struck the antelope while it was mating with a doe. The antelope was Sage Kindama and the doe was his wife. To make love freely in the open, they had used their yogic powers to turn themselves into animals.
Before dying Sage Kindama cursed Pandu that since he killed him while he was making love to a woman, Pandu would never know the pleasure of lovemaking. If Pandu touches a woman, he would die instantly.
Years later Pandu appened to see Madri returning after taking bath. He could not resist the beauty of Madri, forgot about the curse, and touched her. Immediately the curse of Kindama was realized and Pandu died.