Celebrity Celebrity Family Celebrity Parenting Rod Stewart Shares His 15-Year-old Son's Response to Sex Lesson: 'Dad, I've Got the Internet' "I have to be several different fathers because of the different age groups of my kids," father-of-eight Rod Stewart tells PEOPLE By Benjamin VanHoose Benjamin VanHoose Benjamin VanHoose is an Associate Editor on the Movies team at PEOPLE. He has written about entertainment and breaking news for over five years. People Editorial Guidelines and Brianne Tracy Brianne Tracy Brianne Tracy is a Staff Editor at PEOPLE. She has been working at PEOPLE since 2016. People Editorial Guidelines Published on November 12, 2021 12:40PM EST Photo: Kevin Mazur/WireImage Rod Stewart had the talk with his teenage son, but it didn't go as expected for the father of eight. The 76-year-old Tears of Hercules musician tells PEOPLE that he had a funny moment with Alastair, who turns 16 this month, when he sat him down to talk about sex. "My 15-year-old is dating girls, so I had to give him a sex lesson. I just told him what he should and shouldn't do, but he's on top of it. He was like, 'Dad, I've got the internet. I know everything,' " says Stewart. Stewart shares two sons, Alastair and Aiden, 10, with wife Penny Lancaster, whom he wed in 2007. Additionally, Stewart has daughter Sarah, 58, whom he and ex-girlfriend Susannah Boffey placed for adoption as teens; son Sean, 41, and daughter Kimberly, 42, with ex-wife Alana Stewart; daughter Ruby, 34, with ex-girlfriend Kelly Emberg; and daughter Renee, 29, and Liam, 27, with ex-wife Rachel Hunter. "I have to be several different fathers because of the different age groups of my kids," explains Stewart. "You really have to treat all of them as individuals with individual problems." Subscribe to our new 12-episode weekly podcast, Me Becoming Mom, to hear celebrity moms open up exclusively to PEOPLE about their extraordinary roads to motherhood. Rod Stewart and Penny Lancaster. Dave J Hogan/Getty Rod Stewart Says Getting Married at 34 Was Too Young: 'I Had a Lot of Partying, Drinking and Shagging to Do' The key to his 14-year marriage with Lancaster, Stewart tells PEOPLE, is intimacy: "I'm not talking about sex, but a kiss and a cuddle and a hold. Penny and I do that every morning. We hug each other — sometimes in bed, sometimes out of bed, all throughout the day. It's a wonderful relationship. Lucky geezer, aren't I?" "I couldn't ask for anything better," he adds. "What makes me happiest now is seeing all my kids and my wife with big smiles on their faces." For all the details on the lessons Rod Stewart has learned about love and life, pick up the latest issue of PEOPLE, on newsstands now.