Just tell him respectfully, sometime.
As a parent, myself:
- I totally don’t mind if my kids tell me they can hear me. I appreciate knowing our communication lines are open.
- I am still going to continue having (probably still loud) sex in the house. Unless my kids fully paying a roommate’s share of the costs to run the home, they’re still kids, not roommates.
- I’ll probably buy the kid some nice noise suppressing audio headset as a shopping surprise, sometime soon.
Uh… So no gift. Got it.