Kristen Bell wants Dax Shepard to ''have his tubes tied'' before she will get intimate with him again.

The 34-year-old actress - who has daughters Lincoln, 23 months, and Delta, two months, with her spouse - insists she doesn't want any more children in the future so joked she wants her husband to have a vasectomy to rule out the possibility.

She said: ''Maybe I'll be a stay-at-home mom. Maybe I'll have had five more kids...

''No, I don't want to be outnumbered! I think we're stopping at two. I'm not even sharing a soda with Dax until he gets his tubes tied!''

The 'Veronica Mars' star admits she worried about becoming ''crotchety'' and not being a ''fun'' parent before having kids but 40-year-old Dax soothed her worries.

She told the new issue of Natural Health magazine: ''Before we had kids, I'd say to Dax, 'I don't want to be like those people.'

''I saw a few parents I didn't envy and was terrified I'd become crotchety and close-minded like them.

''And he said, 'Those people had bad personalities before they had kids.' Which is maybe the best point ever made. I was like, 'You're right! And we're fun, so let's stay fun.' ''