I am on the fence with this topic. On one hand, it is unrealistic to think that you will NEVER touch another man again for the rest of your life if you are in a relationship. Just address your natural biological needs at the very start.
On the other hand, there is nothing wrong with being single! Why does somebody need to be in a relationship if it cramps their style? The problem with trying to have it all is that you end up having nothing. I cannot express this strongly enough: A life partner and a roommate that you occasionally sleep with are 2 different things. Many gay men in relationships have the latter and try to pass it off as the former. It's like somehow many gay guys don't have best friends anymore and their boyfriends become their only close friend
And I do have to throw in a bitchy comment on the sly, so I apologize in advance. Open relationships tend to be situational and not philosophical! Many guys who are in open relationships would be fine with monogamy if the man that they REALLY wanted came along! It is no fun to be a placeholder while your man auditions other men for the role of boyfriend. But if a guy ONLY wants open relationships in general, now we're cooking with gas! Those guys are being true to themselves in relationships, rather than giving half a loaf to a guy that "will do for now".
Yes, this was a long post but the whole monogamy/open relationship thing is a favorite topic among my friends and I.