Is there a prayer called the "Sunnah of Marriage" prayed as two rak'ahs before consummation (intercourse)?

There is no harm in praying two rak'ahs before entering the mosque, following the example of some of the Salaf. And if one does not pray them, there is also no harm, as the matter is broad, and there is no authentic Sunnah that can be relied upon in this regard.