Well I guess everyone has their right to their own opinion but I think that any two people that can find common ground and can harmoniously express the love in their hearts in an emotional, mental or physical way, that is grounds for a good marriage.
Divorce is not an answer anymore than an amputation solves a problem. It only is something you do if you try everything else and there is no workable way.
If two people are friends and you do not belong to an organization that tells you how you should behave, then you are free to choose in my opinion.