Invocation to be recited before intercourse

 

192. Bismillaah. Allaahumma jannibnash-Shaytaana, wa jannibish-Shaytaana maa razaqtanaa.

With the Name of Allah. O Allah, keep the I Devil away from us and keep the Devil away from that which You provide for us.

Reference: Al-Bukhari 6/141, Muslim 2/1028.