I had a friend that WAS murdered doing exactly this same thing. Several of us had been out that evening partying together and he left early. They found him the next day. He was 22. I have never gotten over it.
Homelessness -> Drugs (often) -> Various intra-veinous drugs -> Shared needles -> All kinds of lovely surprises next time you go to the doctor.
Can you see where I'm headed here?
You think because he is straight and not doing drugs, the risk for STD is low? Think again. He just fucked a homeless chick that is turning tricks for food and they didn't bother using a condom.
Those are a summary of reasons to think thrice about doing this.
Don't think all homeless people are like that, though. When I was briefly on the streets, I knew a gal with like $35,000 in the bank. If she'd gotten an apartment, she would have gone through that fast; as it was, by taking odd jobs as she could, she was adding to those saving so she could buy a used RV -- and become only semi-homeless.
(Speaking of semi-homeless, I met some truckers once who live in their semi....)
Homeless people are just that. People without a home.
Before you do this, make sure any valuable thing you might have is locked away in a place where your guest can't find it (and the key also isn't around).
Some might drug you and try to steal your things when you are out.
Be careful, and be sure to give them some money (but don't overdo it) when they leave.
I was homeless myself, and this arrangement suited me. Please be generous because life on the streets is often difficult, clean clothes and maybe some food are much appreciated. You can put their clothes in the washing machine while they stay at your place.
The washing machine idea is a good one; I pulled it a couple of times when I had college guests home from OSU.
taking advantage of the homeless is disgusting
don't have any pretense about being anything else than a manipulator and rapist
you don't have to hold a gun to someone's head to be a rapist -
the worst type of rape is those that have playing with the live sof those that don't
one can dress it up any way they want but some things are just wrong
edit:
sorry I didn't realize it was an old thread but my point stands and what motivation on earth would cause this to be bumped up again
Extending the reasoning many have used for objecting here, we'd have to conclude that any time a guy with a better economic condition hits on a guy with a lower one, it's immoral. This isn't really that much different from a 22-y.o. with a $45k/yr income being picked up by a 52-y.o. businessman with a $125k/yr income; often that's for some economic benefit. For that matter, people of more similar incomes buy drinks for another guy in hopes that the "input" will incur a reward.
For a homeless guy, a shower, a good meal, a warm bed, and clean clothes can be such a major gift that they willingly go for sex out of gratitude. Sure, sometimes it's out of a sense of obligation, but in either of those there's a core condition: they agreed.
It comes back to that basic principle of civilized behavior, "You own yourself", and the derived fact that all free interactions between individuals are of a contractual nature -- good contracts, bad contracts, fraudulent contracts, but contracts.
The OP is clearly honoring this: there's no pressure, no requirement, only an offer of home-style living for a night, anyway. Sharing the bed is more a suggestion than pressure, though I would add a cautionary, "Are you sure?" before engaging in anything.
It's about respect about his self-ownership, and as long as you're not exerting pressure, it's ethical -- it's just one more economic arrangement, like taking a guy to dinner and a movie and expecting to get sex.
Of course it's about respect for yourself, too -- so be cautious, and safe. Personally I'd say that means get to know the guy first, before taking him home -- including buying a meal or three, without any conditions on it.
note: I lived on the streets for a while, though for most of it I had a truck to "live" in. I even picked up a guy who had a home, once or twice; they thought it was exciting to be "homeless" for a night and have a little fun out in the corner of the Walmart parking lot.