Question about 1,001 Nights, when King Syahryar deflowered Shahrazad, her sister Dunyazade was 'waiting under the bed'. What does it mean?

by Xiao8818

Does this mean the writer implied that Dunyazade watched her sister having sex with the King? Was sex seen as something not private enough to let someone else watch a couple copulating?

AlfredoEinsteino