What Consenting Adults Do In Private Is Their Own Business. Period.

If the activity involves violent coercion, or non-violent coercion, or under age children, or human trafficking, then the activity is both illegal and immoral, and it should be prosecuted to the fullest extent of the law.

Outside of that, whatever consenting adults do in private is their own business. Period. You and/or I may disapprove of it, frown upon it, and not want our kids to do it when they become adults, but as long as it is consenting adults, it's none of our business. NONE.

Be very careful of allowing people to regulate your private behavior. Sooner or later, what you believe may be innocuous, they will see it as a threat to the health of society.