<p>What are the advantages? Simple. Sharing a building with someone else reduces costs. Moreover, two people are better than one in a lot of things. And there isn’t a possibility of the involvement of intense feelings that could trigger things like sexual jealousy or divorce or that sort of thing. The two people could just be close friends.</p>
<p>Problem with that is most people don’t want to “be alone” for the rest of their lives, they tend to move on. If you think this will be a forever deal, you probably will be upset when the roomie says I’m getting married! Then you are stuck with the bill!</p>
<p>Well, most people do desire romantic relationships and, as a result, probably wouldn’t want to have a same sex, non-romantic roomate for the rest of their life. I know I wouldn’t. IMO, the benefits of a romantic relationship far outweigh the possible problems that could arise from one.</p>