Last Christmas was filled with yuletide carols and lots of condoms for 17 star Zac Efron.

Zac’s mom, Starla, has been providing the 21-year-old heartthrob with plenty of condoms since photos of him and girlfriend, actress Vanessa Hudgens, in what appeared to be a sex shop surfaced online last year.

“It was Hallows Eve like, two years ago. It was just a costume store,” Zac explains to the April issue of ELLE. “In the back they have an adult section for adult costumes. And this nice older woman asked for a photo.”

“My mom is like, ‘Zac, what did you buy in a sex shop?’ I was like ‘Mom, calm down, it’s not a sex shop.’ She wouldn’t have any of it. She’s like, ‘I knew you were being sexual!’” he says. “But she understood. My stocking was full of condoms this Christmas. She buys me the economy box.”

The actor als admits that he doesn’t always understand why the High School Musical films that made him a star are such a hit.

“As far back as I can remember, I couldn’t understand or relate to a lot of kids. I still don’t understand how ‘High School Musical’ became a hit.”