Du`a Before Sex
Question

I have a question that everyone I asked had a different answer for. Does the Muslim have to say anything during the sexual intercourse? And does the Muslim "husband and wife" have to pray before the first day of sexual intercourse?
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Praise be to Allah.Du`a before sex
Among the manners prescribed by the Shari’ah is that the Muslim should say when he commences intercourse with his wife :
"In the Name of Allah,  Oh Allah, shield us from Satan and keep him away from us and from what You [may] bestow upon us (i.e. children)" Narrated by Al-Bukhari, Fath ul-Bari No. 138)
Transliteration of du`a before sex
​​​​​​"Bismillah, Allahumma jannibnash-shaytan wa jannib-ash-shaytana ma razaqtana"
This opening invocation is useful in that if Allah blesses the husband and the wife with a child, this child will not be harmed by Satan.
As for what is to be said by the husband when consummating the marriage with his wife, please see this answer: 854 .
And Allah knows best.