I've had family in sex work, a prostitute aunt and a porn star/rejected stripper cousin (surprisingly from different sides)
I'd be sad if my daughter got caught up in it, and a bit grossed out if my son did, but I wouldn't disown them (avoid their lips like hell, tho)
But there's no way I'd let my kids go on without making them severely uncomfortable about it after bringing my disappointment to view
Imagine:
"Honey, you need to work on your form"
"Baby girl, wasn't that guy just a bit old and fat?"
"Son, remember, they're faking the orgasms"
"Has your p*ss dried out from those weird lubrication pills, yet, honey?"
"I don't think a healthy erection lasts that long, dear"
"All this sex, but will I ever get grandchildren, though?"
Coming from your mum