My children DO know our lifestyle...a married, committed, MONOGAMOUS lifestyle. Do you think a lifestyle means knowing each and every detail?
Again, I say, unless you totally isolate yourself from your children, they will find out, even those things you had rather they not find it. It is the nature of the child.
My point is valid, because if the parent feels compelled to hide their lifestyle from their children, the parent's would do well to re-examine their lifestyle.