So doesn't this seem kinda strange? I also thought at the time that it seemed out of character for Glenn to let Ivy bite him, or for Ivy to want to. In which case, are we talking just your average human dating between them? If sex is involved already, I don't understand how Ivy can have sex with a human and not bite them. She's shown a clear struggle so many times to even touch Rachel chastely without feeling the need to bite her. How the heck does this work with Glenn?