If he is hiding; he is lying... If you have yet to discuss anything with him you might want to do so and quick since it is bothering you... Also it amazes me that marriage of union and commitment can now be categorized as "open"... When you make a relationship like yours and your husbands open then I see failure written all over it. I hope all goes well for you but it seems as if that by the small chance that your husband is not gay and just using you for what he thinks to be "ethical" reasons he is bi and there is a possibility that he can become attracted to men... My question now is has he always liked receiving anal since you could rememeber or is this a new development?