i disagree kids will learn this from school and they are not stupid.kids from the start what parents do in bed i do not know what the big deal one i hear my mother having sex with my step father and i was only 13 years old she was screaming and crying i knew what they were doing of course i did not ask i left it alone i was old enough to understand what adults do is something natural that we humans do.theirs no shame if kids seem that kind of thing just explain to them that mommy and daddy need alone time they will understand. :)