Modesty

It is reported:

أضاعت أعرابية ابنها في زحام، فظلت تبحث عنه وتناديه، فقيل لها: اكشفي وجهك لعله يراك فيهتدي إليك!
قالت: ضياع أبنائي ولا ضياع حيائي.
A Bedouin woman lost her son and she was looking for him and calling his name.
She was told: “Uncover your face, so that he might recognise you!”
She said: “I lost my child, not my modesty.”

There are also very extreme examples, like this:

“Saudi Man Married for 47 Years With 10 Children Has Never Seen Wife’s Face”: https://lifeinsaudiarabia.net/saudi-married-for-47-years-with-10-children-never-seen-wifes-face/

This extreme level of ‘ستر’ still happens in rural areas.

It is said that they don’t even see each others private parts during intimacy. They just make a hole opening in their clothes and perform the act. In ancient times, they actually believed that looking at the private parts of your spouse causes blindness. This topic of discussion even crept into some classical Fiqh books.