Instructions
Make your Sims spend time together so their relationship grows stronger. Use romantic emotes to make their bond grow (for example, make them hug and flirt often). Avoid repeating the same moves or going too fast and making your Sims uncomfortable.
Monitor the progress of your Sims' relationship by clicking on the couple standing at the far-right side of your tool bar. This provides information about the couple's feelings for each other, letting you know when the time is right to propose marriage, which is when both Sims find each other irresistible.
Propose marriage to your girlfriend Sim. If she says yes, you can have a long engagement or you can marry quickly. Select the private wedding option to get them married immediately so they can move in together.
Review the household-transfer menu that pops up after your Sims wed. Click and drag your Sim wife's avatar to your male Sim's home. Confirm your choice and your female Sim will move into the home.