My parents were always very affectionate but the most we ever had to clue us in to their playtime was Mom going to “read a book” while Dad “took a nap” with their bedroom door locked. It wasn’t until I was 16 or 17 that they started getting noisy, waking us up in the middle of the night & stuff. My two sisters & I joked that our boyfriends/husbands weren’t part of the family until they heard our parents’ bed squeaking.