OMG, If my DD wants to "play house", then she better darn sure get married. I am not talking about the sex part either. Sorry, but Mr Man, doesn't get to live with my DD and get the fun and perks of living together without a ring on her finger. Luckily she feels the same way.
And "full of crap" on the living together before so you aren't flirting with disaster. If was true, then why do so many people get divorced after 10 and 20 ears of marriage. Either it works, and hopefully you make it work, or it doesn't. Sometimes there are circumstances that just won't allow the marriage to work, but living together doesn't erase any of that.