It can be a risk. But a good partner can also be an asset. In the book The Millionaire Next Door, many of the interviewees credit their spouses (usually a wife) for helping them succeed and keeping expenses low.
You still have to pick the right partner, but if you can do that, it could be a big plus.
But hey, I'm getting married next month, so take what I say with a grain of salt ;)
Get romantically married, but don't sign a contract with the government! By not singing some paperwork you can both avoid of alot of problems (but not all). Frame it like this: honey, I want to get married with you, not sign a business contract with you. Or I want to get married with you, not with the government too!