I don't think it's offensive to believe God has a penis. I think its offensive to discuss God's penis. Discussing penises in medical situations is not offensive, but then I'm generally not talking about a particular person's penis. Similarly I do not find it offensive to discuss animals with penises, but I might find it offensive to talk about touching those penises.
Where in the world did I say anything about touching an animal's penis? I didn't! I said those blind men touched something that felt like a penis! Not that they were grabbing an elephant's penis! Eww. I don't even want to think about that!
Apply it to the analogy. The blind Mormon touched something on the elephant that felt like a penis and said, "My this elephant (God) is very like a man!"
If folks want to be offended by that, more power to them, but I don't know how they get along in their everyday lives.
KA