I've been on both sides of this situation before. Completely supported my one boyfriend for two years while he sat at home and watched soaps and ate junkfood. Then a couple years later I ended up living off a boyfriend.
Honestly both situations were really sucky. Now I look for someone who can be somewhat of an equal for me. I mean one of us can pay for more than the other of course, but as long as we're both putting something on the table. This goes for all regards really too though...financially, emotionally, physically.