Moms with kids. Help me out

My kids are a giant cockblock for our sex life. (12 yo and 15) We all deal with the regular parenting stress but the stress and fear of the damn kids walking in or even knocking on the door is a big obstacle to regular sex in our house. My wife is so paranoid that is where her head is at which isn’t conducive to the moment.

Any tips? Secrets? (Other than hotels, time of day and location?)

I grew up knowing that when the TV was on too loud and my parents door was closed. Don’t effing knock. My wife is mortified that our kids might know we had sex more than twice.