To get married easily, invite a Sim of the opposite sex. But first, always throw a party and pick the Sim you want to marry. "Greet" them, "Talk" to them, then when they want to leave you will know their phone number. After dark, call that person. "Invite" them over. If they say "Sure", wait for them. Get to know them more. When you get the chance to "Flirt" with them, do so. Sooner or later she or he will fall in love with you. The next day (or perhaps on same day), get your Sim in a good mood (three green bars or more). Then, "Serve Dinner (Lunch, etc.)". When they are done eating as much as they desire, watch television. While they are watching television, highlight your "Guest" and give them the command to "Watch TV". They will "Watch TV" with you, talk to you, and their comfort will rise. Next ,"Talk" with them, "Tell Jokes", "Hug", "Dance", etc. If your Sim is still in a good mood (three green bars or more), you will have the option to "Propose" to the Sim you want to marry, Sometimes they will not accept (you will hear warning sirens) and they will state a reason. Do whatever they wanted you to do. When you fulfill their requests, "Propose" again. If you are lucky, they will accept. Note: You can only do this in Play The Sims mode.