Phil imprinted on humans and thinks he’s human. It’s is mentioned here http://www.gocomics.com/skinhorse/2011/05/21and the strip previous to that one is his introduction.
Futabakun, Unity has been referrred to as “she” in the past. I can’t recall any sexual behavior/interest/comments on her part, though. I can’t recall it having come up, and I’ve been reading from the first strip, too.
@ladyfingers86, as a manager at McDonald’s, I would like to say that you are absolutely right—in fact, I do more gross jobs than my crew! :)