MPs have voted in favour of the Marriage (Same Sex Couples) Bill with a majority of 225.
The second reading vote received 400 Ayes to the right against 175 Noes to the left.
The Commons has now cleared for the second time as MPs return to the lobby to vote on the timetable of the motion - setting out how the Bill will proceed through the House.
Landmark plans to legalise gay marriage got the green light in the Commons, despite a majority of Tories failing to support the Government.
The Prime Minister will read the letter delivered to Number 10, take their views on board, but not change his mind over gay marriage.
Many Conservative MPs just do not understand the move when the tax measure is in the Coalition Agreement.