NB: I'm single and there's no man on the horizon looking to move in. But I have seen so many scenarios on MN where the man has moved in and taken the piss, or the other extreme, they have moved in and their choice is to leave is to become homeless.
As a layperson (that clearly no one wants to live with anyway!) What is the holy grail?
A) they move into your place, turn into a dick, don't pay anything, it's almost guaranteed they will become a cocklodger. I suppose you can kick them out. They have no comeback about bills etc. MN will tell you off for finding a cocklodger 
B) you move into his place. You can leave whenever you like and bills are his but he also has the power and you're walking into a homeless abyss. Worst case you could come home and he's locked you out!
C) 50/50 sounds sensible until he realises that you're liable for the bills he doesn't pay, which can get messy. You're sat they're paying his half while he eats your food and gets designer watches
Is the only answer simply to never live with a man?
Before some snide MNer comes on. My examples are actual quotes from actual threads, so no, I'm not "jealous"
Seriously though, how do you move in and protect yourself? Yes ok most of your partners are thankfully not dicks, but we all know it can go pear shaped in a second.