The model has been married to the guitarist and songwriter since 2019
Klum, who has been married to the German guitarist and songwriter since 2019, had a cheeky answer when it comes to how she likes to keep fit.
"Sport en chambre is my favorite exercise -- it sounds better in French," she said. The phrase loosely translates to "bedroom sports."
"I have a younger husband. I also run around a lot, having four kids. I don't have an assistant, so I don't have people pack for me or carry my things, I do everything myself."
She continued. "I eat right, I never exercise too much or do heavy weights. People can push themselves too hard. I listen to my body."
"I have no back or knee pain and I have my husband," Klum added. When asked by the outlet about whether sex with Kaulitz is good, Klum responded, "Very good. My husband is my match."
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Related: Heidi Klum Says Her Kids 'Have Their Own Ideas' for Halloween Costumes: 'Lou Makes Her Own Things' (Exclusive)
Elsewhere, the supermodel discussed wearing different looks on the catwalk and for her TV hosting gigs.
"I like it when designers transform me," she told The Times, before revealing what Kaulitz would like to see her wearing regularly, as well as her favorite outfit for him.
"I don't like being boring or safe, otherwise I could be at home with my kids. My husband would love me in pink miniskirts all the time. He can wear anything. I love him in a suit or ripped jeans -- but best of all, nothing," Klum shared.
The supermodel's comments come after she and Kaulitz attended her 23rd annual Halloween Party on Thursday, Oct. 31 at Hard Rock Hotel New York: The Venue on Music Row.
While Klum was dressed as the female version of E.T. from Steven Spielberg's 1982 film E.T. the Extra-Terrestrial, Kaulitz portrayed the male version of the alien.
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Related: Heidi Klum Reveals Son Johan, 17, Might Go to College in New York: 'Very Much Into the Arts and Making Clothes' (Exclusive)
The America's Got Talent judge -- who shares shares Leni, 20, Henry, 19, Johan, 17, and Lou, 15, with ex-husband Seal -- also spoke about receiving negativity online after marrying a younger man, though she noted that she has "a tough skin."
"I can cut out the noise when I go home, close the door and have a barbecue with the kids," she told the outlet.
Klum has long been speaking highly of her husband, including in 2020, when she talked to PEOPLE about social distancing with him during the COVID-19 pandemic.
"All I can say is I picked the right person, hallelujah. He's amazing," she told PEOPLE at the time.
"So far, it's been amazing. I picked the right person. It's a different kind of living right now because normally you see work people more than your own family and now the roles have reversed. It's good," she raves.