Game guide:Easy friends

How to get friends quickly
If you need fast friends, there are heaps of ways to get them. One of the ways I use is buying the Office Hero lifetime reward and building up Charisma skill. Then, you will become friends with your co-workers very quickly, if you pick the socialisation tone. This varies from career to career. Examples are Chat at water cooler, Discuss News with Co-Workers, etc. An easy way to get friends, with no effort on your part.

But the next way is one of my favorites. Buy the Legendary Host lifetime reward, and meet some sims. Then throw a party, inviting them. With Legendary Host, they will always come to the party, even if they hate you. Just invite the same sims for a few consecutive parties, and watch the relationship values soar. Even if you mistreat them, they will still get a gain.

So, there we have it. Two easy ways to get friends, which are guaranteed not to mess up your game.

Fast Friends in The Sims 2
One of the fastest ways to earn friends in The Sims 2 is to obtain the Voodoo Doll from Twiikii Island. Use the Voodoo Doll to make friends by selecting Voodoo on the pie menu, and then friendship. You can also earn new lovers this way, which is helpful if you are a romance sim. Be warned, overuse of the Voodoo Doll will lead to some nasty side effects...

Disclaimer
These only work in the Sims 3, PC version.