Actually, you answered your own question:
... although, I don't think you are actually bi-sexual as you don't have emotional attachment to men, just their dicks. Also, as you have no desire to engage in anal sex, the best description is that you are a "Cocksucker".
Its great that you and your wife have activities that you are able to mutually enjoy and that seem to have brought you closer together.
That's the best way to find out if it is something you really enjoy or if it is something better left to fantasy. However, if you try it and enjoy it, it may then become an obsession, so make sure you and your wife have discussed it and are prepared for whatever may come of it.