Ryan Reynolds' daughter calls him ''Mama''.

The 'Deadpool' actor - who has a nine-month-old daughter James with 28-year-old wife Blake Lively - joked he had to sit the tot down and explain the difference between men and women to her.

During an appearance on 'The Tonight Show Starring Jimmy Fallon', he revealed: ''She's saying 'Mama'. What my wife doesn't know is (James) calls me 'Mama' too. Seriously. I literally had to sit her down and tell her that penises don't work that way. She understands - she gets it.''

Ryan also insisted that he is no longer cool since becoming a dad.

The 38-year-old actor said: ''I've definitely lost all cool. I'm the dad guy now.''

Ryan recently revealed that he was devastated when he discovered one of his friends he'd known his entire life had tried to sell pictures of his baby.

He told GQ magazine: ''A guy that I'd known for my whole life, one of my closest friends growing up, he had been shopping pictures of my baby around.

''I kind of got in front of it, which is good. But it was a slightly dark period. A bad couple of weeks... It was like a death. It was like one of those devastating things to find out.''