Dua for Intimacy With Wife

بِسْمِ اللَّهِ اللَّهُمَّ جَنِّبْنَا الشَّيْطَانَ وَجَنِّبِ الشَّيْطَانَ مَا رَزَقْتَنَا

Bismillah, Allahumma Jannibna-sh-Shaitan, Wa Jannibi-sh-Shaitana ma Razaqtana

Pronunciation: I am having relations in the name of Allah. O Allah save us from Satan and keep him away from the children You grant us. The child that is born after the recitation of this dua will never be harmed by Satan

Reference: Sunan Abi Dawud: 2161