The Spice Channel! I remember that from hotels in the late 1980s... and I suspect you might be right on the level of explicitness. It was probably hotter to see it scrambled and imagine!
Many years ago I stayed at a Hilton in Mainz, Germany. On the regular TV channels they had hardcore porn. Just a 5 minute preview but 4 channels !!! The best part is it would reset so if you changed the channel the 5 minutes would start over