The former Manchester United star was criticised by some fans after posting a photo with him and five-year-old daughter Harper on Instagram.
Speaking during a Facebook Live interview, he said: "We want to show our kids love."
David Beckham's wife Victoria was also criticised for posting a picture of herself kissing their daughter on the lips last year.
"I got criticised for kissing my daughter on the lips the other day," he said.
"I kiss all my kids on the lips.
"Brooklyn, maybe not. Brooklyn's 18, he might find that a little bit strange.