So can a child know what mom and dad do in bedroom

My daughter is 4year old and shes been saying mom and dad kiss and shows you like shes kissing the other person but isnt kiss anyone. At night if we want to have intercourse we put her in her bed room until we are done we tell her that mommy back needs Help.its just alil weird to me and her dad shes never been away from mom from birth to now unless I run a errand or something but never away from her for to long and dad watches her no one else. What should I do.

I don't understand why it's a problem that shes in her own room while we have our adult time. Dad works early in the morning so bed time is early and she isnt ready to go to sleep yet. It's what works for our family. Thanks for the negative comments.

We try to wait for her to go to sleep first..most the time we dont have sex for weeks and weeks...

I was just curious is there something we could do to help her not do these copying kissing we kiss in front of her put not French kissing or anything like that just a good by kiss peck.