In the October issue of GQ, Justin Theroux says fiancee Jennifer Aniston wouldn't let him keep an STD art collection he owns in their Bel Air mansion. Credit: Sebastian Kim/GQ

Learning to make compromises! When Justin Theroux moved into his new Bel Air mansion with fiancee Jennifer Aniston, he had to part with a graphic art collection. In the October issue of GQ, the 42-year-old actor opens up how his relationship with Aniston, 44, has changed his life -- and taste in decorating.

"I have these beautiful wax-museum pieces—handmade, from the 1800s—from a museum of curiosities. They're just these open mouths, with tongues, and in the throats are different stages, labeled, of syphilis and gonorrhea and whatever," he tells the magazine.

But it sounds like his bride-to-be doesn't find them to be quite as "beautiful" as he does. "Those definitely found a great place in my office in L.A.," he explains. "They weren't going to be above the fireplace anytime soon."

The Wanderlust costars became engaged in August 2012 after more than one year of dating. "It's a bit like going to a slightly different altitude, you know?" Theroux tells GQ of how his life has changed since he started dating the beloved Friends star. The actor joked that it can be weird "when I get complimented on the street because I'm having twins."

But the two seem to compliment each other well. Theroux says he's terrible at sports and "that's one of the things Jen loves about me." He also reveals that they both wanted to buy their $21 million home, in part, because it came with six chickens.

"We inherited the chickens from the previous owners," he says. "They were like, 'Of course we'll get rid of the chickens,' and we said, 'Are you crazy? Don't get rid of the chickens. That's half the reason we wanted this place.'" 

For more of Theroux's interview, pick up the October issue of GQ on newsstands nationwide Sept. 24.