Dua before intimate relationships. One of the noblest purposes of sexual intercourse is to bring to life a righteous offspring. Therefore, it is important for spouses to pray to Allah to remove Satan from their offspring.
Ibn ‘Abbas (may Allaah be pleased with him) narrated that the Messenger of Allaah (peace and blessings of Allaah be upon him) said:
When one of you wants to approach his wife for intimacy, let him say: (In the name of Allah, O Allah, remove the devil from us and from the one who will supply us with it!) If from that relationship it is destined to have children, the devil will never harm him. “
Bukhari and Muslim.
FROM THE BOOK “MARRIAGE INTIMATE ACCORDING TO AUTHENTIC SUNNA”