Welcome to YT! There are lots of knowledgeble people here (I don't consider myself one of them, I'm usually the one asking the questions
)
I have a little girl so I can't help you with the penis thing, sorry! Most yorkies do seem to need baths quite frequently. If Madeleine doesn't get a bath every week she looks a mess!
Maybe you could take him to an obedience class. They could work on the biting and learning what no is.
Good luck with Romeo and keep reading, you will learn so much
