Figuring out whether the man or woman you're withis the ever-elusive 'one' is no mean feat.
But, if a new checklist is to be believed, it's rathersimple to work out.
According to a study, couples who talk about bodilyfunctions, have access to each other's passwordsand shower together are the most committed.
Planning a holiday, driving each others' cars and having a key to your partner's flat are othersigns that a relationship has got serious.
Researchers quizzed couples on the different stages of their relationship to determine the topsigns that indicate a couple are past the 'seeing each other' phase and taking things into moreserious territory.
Posting a 'loved-up' photo on Facebook, changing your status to 'in a relationship' and beingintroduced to wider friendships circles also show couples are the 'real deal.'
Meeting potential in-laws, staying overnight and divulging salary details also prove thatcouples are the 'real deal.'
The study also highlighted that couples deem a relationship more serious when they get morecomfortable with each other - which means seeing each other without make up, showeringtogether, lounging around the house in pyjamas and even discussing intimate health issuesand bodily functions.
Other relationship milestones include meeting the parents, becoming the 'plus one' on allinvites, seeing each other through an illness and comfortably phoning each other at work.
Buying a dog or cat together, choosing their partner's favourite foods in the weekly food shopand sharing their friends secrets are also sure signs that you're with the one, according to theresearch by Monarch.