Ah, those harsh puritanical mores of modern America. The bride is still a virgin, and the groom will soon have sperm from his ears, so he wants to fuck, but it’s impossible before the wedding. But it’s impossible with the bride, but with a bridesmaid or a witness in our opinion, it’s possible, especially when she herself doesn’t mind. The groom knows the joys of extramarital sex even before the wedding, and this is a vile betrayal, but such is the harsh world.