Some reports have been narrated concerning that from some of the Sahabah, which speak of praying two rak`ahs before consummating the marriage. But there is no reliable report that has been soundly narrated. But if someone prays two rak`ahs as some of the early generations did, there is nothing wrong with that, and if he does not do that, there is nothing wrong with it. The matter is flexible, and I do not know of any reliable, authentic hadith that speaks of that.
End quote from Fatawa Nur `ala ad-Darb, 3/1602.