I don't want to call you bi. But you may be, because of having sex with three men.
That's really your choice in the end, no one can really define you but yourself.
Having anal stimulation is nothing having to do with you being gay. The anus is just a very sensitive area that can be stimulated for great pleasure on males. So if your conferable with it go and enjoy your self.
You probably are, but just be faithful toy our partner/spouse, and have fun with life.
