To the commenters saying or thinking "No way my child(ren) will hear me having sex", it sounds like you associate "sex" with something "bad, dirty or distasteful". I.e. you find it somehow "shameful"; why striving to hide it otherwise?

We feel the need to hide only what we're ashamed of.

In these cases, I would suggest to these people to question their own feelings, and ask themselves where does this shame comes from.

Having sex is as natural as it gets, and there's nothing shameful in it, per se. If you feel shame about sex, someone put that idea into your head.