Matthew McConaughey's Father Died Having Sex With His Mom, She Says

Matthew McConaughey's father died having sex with his mom, Mama McConaughey says in her new book, "I Amaze Myself!"

“On Monday mornings, he and I often said goodbye by making love,” Kay McConaughey tells Us Weekly. “But one day, all of a sudden, it just happened. I knew that something was wrong, because I didn’t hear anything from him. Just nothing," she says. "But it was just the best way to go!”

When her husband couldn’t be revived, she made sure he was taken from the house in the nude.

“I was just so proud to show off my big old Jim McConaughey — and his gift,” she says.

Kay McConaughey also says her famous son, 38, was a happy accident. It was just after she’d married Matthew’s dad for the third time.

“I was deciding, ‘Do I want to have another baby? Do I want to have an affair? Or go back to school?’” she says. “That’s when Matthew was conceived. We had tried for 16 years and no baby. So Matthew was a big surprise!”

Click here to read more on this story in Us Weekly.