Aries, your post about Hakol B’seder is hilarious.
Boys and girls at the same Shabbes table, Lo B’seder!
Moreover, I’ve heard of takanos from Rabbi Moskovits from Midrash Shmuel that (young) couples should not invite each other for Shabbes meals. It causes shalom bayis problems. Some women cook gourmet food, whilst others make simple food, some men give profound divrei Torah, whilst others are not so gifted, some men sing beautiful zmiros, whilst others sing boring tunes. These eye-openers are no good.