Jennifer Aniston makes her husband Justin Theroux laugh so much that he quite often crashes to his knees in hysterics.

Justin Theroux and Jennifer Aniston

Justin Theroux and Jennifer Aniston

The 44-year-old actor married the former 'Friends' star, 46, in August last year following four years of dating but their romance is still very much alive and couldn't be more "fun."

Speaking in a video for Loaded magazine, the hunk said: "It's a laugh a minute. When we get on a run, it's pretty fun. "There's been a couple of times when she has brought me to my knees laughing and me her.

"Literally, there was one time and she did something so funny and I was literally on my knees. So yeah, it's a fun house."

And it's not just their hilarious antics that have upped over the last five years as their sex life has also taken a turn.

A source explained: "She says their sex life is off the charts, and Justin is very adventurous. Their new thing is eating dinner in the nude! Jen says marriage seems to have made Justin even more passionate."

But, while the couple are madly in love, they try not to spend more than four hours together every day in a bid to keep their spark alive and relationship exciting.

An insider said recently: "There's no doubt they love each other and really are best friends, but they are careful not to spend too much time together. They just enjoy their own space too much. They flirt by text and love to send each other pictures of their wedding rings."