This is one of the key cultural norms, ex. that you can only be respectful or even decent, much less intimate, to a girlfriend/wife, and not anyone else. It's something both genders reinforce in their own ways, I guess the purpose it serves is basically re enforcing marriage? and discouraging anything else, to create a negative feedback loop for that experience. That has to come from like puritanical times and norms.
Have a homie who will sleep with someone and then sneak out the door, like some shyt out of a bad teen movie.
. I said when I was picking a place to get drinks at. She asked me if I usually look for a hotel for dates.
Breh SHE GOING!! What area you goin on date, we can find the airbnb for you breh.. Though shyt might be expensive cuz its HIGH season and snow birds in town for christmas/new years 
I have a post in my head I been trying to find the time to type out of the shyt I have heard and seen these last couple weeks in my holiday parties rounds I have made. ALOT of brehs are in situations they are not aware of, Its SOOOOOOOOO many women in workforce who are just doin crazy shyt. The Industries I am privy too, its just completely insane. Believe me when I tell you, you have been blessed.