We've had plenty of gay couples stay with us, and I never gave it a second thought. And, we've had plenty of unmarried couples stay with us. A few times only one half of the couple was unmarried, but we didn't say anything. That being said, I also don't have a problem with this guy's listing. He's renting a room in his home.... as in.... he's inviting people into his home. They're under his roof. They're not out in the garden shed, or in the apartment over the garage.... They're in his home. He's even kind enough to offer to share his evening meal with people. It is his Home... he has his own moral standards that he lives by.
I'm far from being a deeply religious person, but I know not to offend people who are. I actually go out of my way to watch my phucking language when I'm in their company, and even more cautious when in their home. If his religion tells him that an unmarried couple should not be sleeping in the same bed, he has every right to say "I don't want that happening under my roof. And for the love of God would you PLEASE cover up those pendulous breasts and all that cleavage you're showing. And that miniskirt? Don't you have something that covers your thighs at least half way to your knees?"
To me it's like the Cake Decorators who don't want to decorate a cake for a gay wedding. If it offends them, just move on. Go find someone who would LOVE to decorate a cake for you. WHY do you want to force someone to put together a creative work of art if his or her soul isn't into it? Just Move the hell along. Go..... There are an Eff-ton of bakers out there who would be proud to do the job. If you want to wear purple pants and fishnet shirts while singing YMCA, go do it where someone doesn't care. There are plenty of us out there. Leave the guy with his lifetime of deep seated moral values and religious beliefs alone. He has the freedom of religion. Respect it.