For context, this was back when TVs were big boxes with a cathode-ray tube (a massive vacuum-“filled” glass bottle with the phosphorus-coated screen on the bottom and a literal particle accelerator on the top, put on its side, and powered with high voltage) inside.

If you can manage to have sex on top of a low cupboard put on top of a table you could probably have sex on top of one of these (though you probably shouldn't, what with the glass, and vacuum, and high voltage, and whatnot), but falling off would probably be a common outcome.

Doing it on top of a modern flat screen would require a much less believable amount of acrobatics.