The actor was happy to pass on his experiences to 11-year-old Jaden - his son with wife Jada Pinkett Smith - but the young star insists he didn?t need the advice.
He said: "My dad said, `Don`t kiss with your mouth open, you`re definitely too young for that!`
"I`m good at kissing, so it wasn`t as challenging as it could`ve been had I not had previous experience."
However, the ?Karate Kid? star admitted he didn`t find locking lips as easy as he expected when it came to filming.
He told the Daily Record newspaper: "It was one of the most awkward things I`ve ever done in my 11 years of being on this planet.
"Our faces were like, this close, and we had to stay there so the shot was right. It`s kind of awkward."
Jaden also admitted he had his mother - who also has a nine-year-old daughter Willow with Will - banned from the set of the film when he was shooting the romantic scenes.
He added: "She agreed to stay in the tent, because she knew that she would come out like, `Jaden, what are you doing, boy?` "
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