in the Goyish society in which we live and whose values we so easily absorb and make a part of ourselves (without even realizing it), (unless we are very careful, work very hard at it and learn and practice Mussar), having couples over is obviously perfectly fine and it is laughable, very laughable that some fanatic Jews living in the dark ages caution about this.
this is exactly the Nisayin we are all facing today.
unfortunately the vast majority of us, as is evident from threads like this, are failing miserably.