I talked to an old guy that use to be a house detective or house dic in the 50s and 60s. Every hotel had one to ensure that working girls were not using it for meetings, this was to comply with municipal law and not risk losing their business permit. Theater ushers were there to ensure there was no funny business in the movies. Evidently, there was as much screwing around in those days as today if you know where to look for it.