By my experience in the Spanish JW community I can honestly say this is pure bs. I have been married for decades and have never experienced this type of intrusion in mine or any other couple's private intimate life. Lies, lies, lies in this regard.
One has to keep intimate stuff private. The Org has no business in mine or anybody else's bedroom.
Outside of adultery or fornication, enjoy sexual pleasures so that marriage is as much fun as possible!
SL