Dax Shepard chewed gum that had already been in Kristen Bell's mouth when they first met.

The Hollywood couple have been married for five years and now have daughters Lincoln, five, and Delta, three, but the pair have admitted their first meeting was less than conventional when Dax agreed to munch on some gum that Kristen had already been chewing.

Speaking to 'Entertainment Tonight', Kristen said: ''He asked for gum, I said 'no I didn't have any', then I pulled [the gum] out [of my mouth] and said 'only this', then he took it.''

And the 'Without a Paddle' star added: ''I didn't say, 'Hey can I have the gum in your mouth,' I said hey do you have any more gum. I was like, 'I'll take half out of your mouth.' And then I did.''

Despite the bizarre first meeting, Dax, 43, then got the 'Frozen' star's number from a mutual friend, and the rest is history.

Their relationship hasn't always been smooth sailing though, and 38-year-old Kristen revealed recently that she finds monogamy ''difficult'' because she's still attracted to other people who aren't her husband.

She said: ''I see the benefits of a society with monogamous relationships, but it's difficult because you're still attracted to other people. Dax was in an open relationship in his 20s and it scared me when we first started dating. We don't have one and I don't know if we ever will.

''I think what alleviates the pressure-cooker of monogamy is understanding that your partner's attraction to someone else is nothing to do with you. I talk about who I'm attracted to in front of Dax, and he'll say: 'I could never pick your type out in a line-up'. If I ever get to make out with Riz Ahmed, Dax will give me a round of applause!

''I've told Dax that if, one day, Jennifer Lopez comes up to him and says, 'I need a weekend away with you in Sonoma', you have to go now, because I am clear that Jennifer Lopez's beauty is not a reflection on me not being good enough. Here's the thing, I love this man and I would not want him to be on his deathbed thinking, 'I could have had sex with Jennifer Lopez...'''