We don’t have any business entering into other people’s privacy along these lines.
I do not approve of it, but we do not know what arrangements have been made between these men/women and their spouses.
The spouses at home may be doing the same thing by other means.
That is between them, not do gooder folks who have no business getting involved.
You are not in a position to assert that.
There is no right to secretly expose your spouse to diseases which could kill or sterilize them.
And absolutely that is implicit in your assertion.
HPV, Herpes, AIDS, even diseases that a so kisser to re not strictly venereal like tuberculosis and hepatitis.
All that comes with adultry.
You haven’t demonstrated any moral or ethical high ground.