On the first night when one is in seclusion with one’s wife, one should take hold of the forehead and recite this Dua;

اَللّٰهُمَّ اِنّيْ اَسْئَلُكَ خَيْرَهَا وَخَيْرَ ماَ جَبَلْتَهَا  عَلَيْهِ وَاَعُوْذُبِكَ مِنْ شَرِّهَا وَشَرِّ مَا جَبَلْتَهَا عَلَيْهِ

O Allah, I ask You for the good that is in her and the benefits of her good habits and character. I seek Your protection from the harms of her evil habits and character.