While playing, you will have the option of marrying an NPC. Your race or gender does not matter. Before you can, however, you must complete the quest The Bonds of Matrimony, which involves speaking with Maramal about marriage in the temple of Mara. A character must also be wearing an Amulet of Mara that signifies that you are available to be married. Of course, the Dragonborn needs to find an NPC who also wishes to be married whose disposition towards you is high enough. They will mention your amulet if interested, asking if you are as well. After the wedding, if you speak with your new spouse, you can determine where they live. If you own property, your spouse can move in with you. Alternatively, if your spouse owns property, you can move in with them. Spouses will also provide a variety of benefits after the marriage, such as the Lover's Comfort bonus.
 The "How To"
There are several ways to obtain the Amulet of Mara. The first is to find one in loot or from a merchant. There are a few confirmed at Bleak Falls Barrow, and a tent near Hela's Folly shipwreck. You can also head to the Riften Temple of Mara and give 200 gold to Maramal. Alternatively, you can speak with Dinya Balu in the Temple of Mara and obtain the quest, The Book of Love. Upon completing all objectives, you will be rewarded with an Amulet of Mara.
It is not possible to marry anyone until you have spoken to Maramal about marriage. Even if the Dragonborn has obtained the amulet from the quest, one will still need to speak with him for any action to be taken upon it. If you've not visited The Bee and Barb before, Maramal will be there and not in the temple, preaching to the bystanders. After having approached an NPC, they may mention the amulet you are wearing. In order for this option to even be seen, you must complete their objective. Some are as easy as hiring them as a mercenary, others will involve a quest chain - Farkas/Vilkas of The Companions, for example.
You can then ask if they are interested. They will do the same - if you say yes, you can then proceed to marriage. In order to complete the event, you will now need to travel back to the Temple of Mara in Riften and arrange the event. If you decide you might not have picked the right person, you can decide not to go through with the ceremony. Then you need to talk to your spouse (who will be waiting by the doors of the Temple of Mara). It is worthy to note, that their disposition of you will drop slightly if you do so.
Right after saying "I do", talk to your spouse before they leave the temple to discuss living arrangements (your spouse may become lost if they leave the temple without discussing this). Whatever is decided may be changed later. Upon visiting your spouse in your home (or your spouse's house), you will be able to ask them about money earned from a store they will have set up. Starting the next day, you will be able to collect a daily income of 100 gold from your spouse (no matter what home he or she resides in). This gold is cumulative - if you wait five days before asking your spouse about it, you will earn 500 gold.
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