1: I think it's meant to be porn playing, and you have to turn it off asap or else the girls get rowdy or something
2: I have no idea either
3: By squeezing the pig, you can restore your sanity during an attack or after the girls are gone
4: I think the vent is just so you know what time it is, I haven't experienced any vent interactions
5: The porn playing is just a random event meant to distract you, there will be more as the game progresses, and I have no idea about the radio
6: Technically no (I think, I mostly just watch them on the cameras and they leave pretty quickly) but you can fix the sabotages in the Goo room, the big main room and the Theatre room to keep the from getting too aggressive (or at least that's how I understand the game rn)