It wasn't like a huge deal because neither Pete nor his girls were home at the time. That being said... he felt like it was one of those unspoken rules that you don't have threesomes in a house where two five year olds live. Maybe it was just a difference in upbringing, but that seemed like something you should, at the very least, warn people about in advance. Pete didn't want to be a stick in the mud and he did like for his roommates to feel free to have their friends over, in moderation, but when it came to his daughters all that easiness and patience flew out the window. So when Bae came home that evening, he hit him with that "Hey man, we need to talk,"
before the door was even shut behind him.