The Klingon wedding was a highly ritualized ceremony, resembling an opera. Klingon warriors beating their drums received the couple as the Lady of the Great House of the groom recited the traditional story of the Klingon creation, in which the Klingon male and female were created and joined together and rose up against their gods. The groom's Tawi'Yan presented the couple with bat'leths as they did mock battle with each other in representation of the struggle of the male and female Klingon hearts against one another.
After the couple recited their vows, swearing to unite against all their opponents, the guests attacked them with ceremonial weapons, the ma'Stakas.
In preparation for the wedding, the bride had to be approved by the mistress of the groom's house. The bride needed to display her ability to perform several traditional Klingon rituals, e.g., the Bre'Nan and the display of Var'Hama candles. She also was required recite the history of all the females of the house she was joining. The groom prepared with his closest male friends, including one designated as the Tawi'Yan, the Klingon equivalent of a best man. They went to a cave, or a simulation of a cave if necessary, for the physical and spiritual journey of kal'Hyah. (DS9: "You Are Cordially Invited")
Klingons could also be wed in a shorter, informal ceremony in which the two participants repeated an oath and then kissed. This ceremony could be performed by the Klingon equivalent of a justice of the peace, or the vow could be taken privately, legally constituting marriage by mutual consent. (DS9: "The House of Quark"; TNG: "Reunion")
"We are not accorded the luxury of choosing the women we fall in love with. Do you think Sirella is anything like the woman I thought I'd marry? She is a mercurial, arrogant, prideful woman who shares my bed far too infrequently for my taste. And yet... I love her deeply. We Klingons often tout our prowess in battle and our desire for honor and glory above all else... but how hollow is the sound of victory without someone to share it with. And Honor gives little comfort to a man alone in his home... and in his heart."