I agree with iam1butterfly.
You know when children are growin up they get confused about their own body parts & stuff related to them. It will leave a child bloomin confused if he/she ever saw their parents havin sex & the funny thing is what if the child talks about the thing he saw with other people, or in school =p
We dont even like our parents smoochin in front us so just imagine them yoohooin ..
... it could have a profoundly negative psychological impact as children could be left with a frightening, confusing and lasting impression of something that they wouldn't be able to understand... Nothing good could come from it.