Young millennial men aren’t into boobs — and big butts might be to blame. While in the millions, the term “breast” only makes up 1.5 percent daily searches on PornHub, an X-rated website that streams free adult videos for the masses.

When it comes to age, older users are more likely to search for breasts on the website.

“Pornhub visitors between the ages of 18 to 24 are 19 percent less likely to search for breasts when compared to all other age groups, but visitors aged 55 to 64 are 17 percent more likely to search,” the site said.

Even more, millennials under the age of 35 are far less likely to search for breasts, regardless of size, when they are compared to older age groups.

It’s not only men who search for breasts, though they are more likely to. “When it comes to who likes boobs the breast, it’s men who are 32 percent more likely to search for breast related terms when compared to women,” the X-rated site explained.

PornHub teamed up with Mashable to see how users searched for breasts on the website. Users widely preferred the natural look as opposed to fake, the survey showed. The term “fake” made up .o6 percent of the search on the site and “small” was at .09 percent.

Big breasts vs. small and natural vs. fake varies depending on the year. “Fake breast searches were quite popular in early 2013, but began to sag near the beginning of 2014 before inflating back up to an above average level between April 2014 to April 2015,” PornHub wrote. “Since then, fake breasts seem to have lost some of their support. Natural breasts experienced their biggest growth period from January 2015 to April of 2016, but have decreased in popularity again over the last year.”

Breast size popularity isn’t limited to porn. Plastic surgeons have also seen a change. There was a 20 percent drop in breast enhancements, a 2015 study by the British Association of Aesthetic Plastic Surgeons (BAAPS) said.

“It was a fashion thing,” Jackie Lewis, a consultant plastic surgeon and BAAPS member, told The Telegraph in January 2015. “It was the ‘in’ thing to be big breasted, this whole ‘I’m a Baywatch bimbette.’”

Lewis argued the amount of breast implants have decreased because people are more genuine now. “I think people are more realistic now. It’s the social climate,” she said.

Natasha Devon, founder of the Self-Esteem team , had a different argument, saying that derrieres were more in style thanks to celebrity like Kim Kardashian and Beyoncé.

“What young people in particular want is to feel special and get attention,” she said. “The fact that so many people have boob jobs [already] is probably contributing to their diminished popularity. Probably a lot of young women, have mothers who had this surgery. They want to be different and special. They’ll move on to the next thing.”

The only way to stop certain body parts from being more popular over another is if they’re all considered desirable. “The way forward is to have diversity and to realize that women are one of the only mammals to come in such a wide range of shapes and sizes,” Devon said. “We have to accept them all.”

Follow me on Twitter @mariamzzarella