For consenting adults who enjoy watching others get their freak on...I'm not going to pass judgement on that. Unhealthy? It can be if it prevents you from appreciating or participating in true intimacy. But for God's sake, keep it away from little kids and pre-pubescent teens who have yet to discover their own sexuality! Why the rush to rob them of their innocence and even purity?
Perverts.
Freaky as you wanna be Bro...but I suspect you'd probably get a little pissed if when viewing on your own one day she suddenly pops onto the screen getting a roto-rooter from two or three perfect strangers?
(She never told you about her brief career in adult films before you two Married)