Imagine openly saying intimate, flirty stuff or sexting your SO in front of a group of your friends. Its extremely awkward for everyone involved.

That reminds me of a joke.

A woman is talking to her landlord about not being able to afford rent. She starts to unbutton her shirt and says, "Maybe I can pay in other ways?" The landlord leers at her, "Oh yeah, you can sexy," he replies licking his lips.

"Damn it mom and dad your children are right here, can't you play Monopoly like normal people!"