So, WTF do you think i would ever be obligated to tell my kids exactly what we do with our friends when we go out at night and leave them at grandma's?
There's a huge, huge difference between what two consenting adults do in their privacy of their bedroom and these same parents bringing other adults into the bedroom. For one thing, you're getting other people involved in the equation, which means psychological consequences, not to mention diseases. And the chances of other people finding out your behavior increase exponentially with each new partner added to the equation.
Nobody said anything about providing details, you are merely trying to set up a strawman.
You said earlier that you wouldn't tell Grandmom or Grandpa that you and the Missus are going away to have sex like 'crazed weasels' or something to that effect.
You don't have to provide any details, but why not tell them that you and the missus need to spend time with other people, and leave it at that. If it's so normal, they won't bat an eye.......
.......or better yet, when your kids get old enough to ask questions about sex and marriage, tell them what you and Mommy do in a mature matter of fact way. Shouldn't be a problem, right?
You could tell your daughter that its okay if she sleeps with a different man every night, people do it all the time, and again, it's normal. Shouldn't be a problem, right?