Wants and fears

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A Want and a Fear are aspects of life present in The Sims 2. Wants indicate something that a Sim well, wants. These wants can include having a child, wanting to get married, or just speaking with another Sim. A fear however, is the downside to life. A fear severely affects a Sim's mood. When a fear is experienced, Sims lose aspiration points (the severity dependent on how high the fear was, via minus points). Wants help Sims gain aspiration points.

Initially, a Sim is born with 4 want slots, however, when The Sims 2: University was introduced, it allowed Sims to get a fifth want slot as a bonus for completing freshman year at College, and to get a sixth as a bonus for graduating. If a Sim gets expelled, the Sim will receive a 4th fear slot.

Fulfilling Wants and Fears
When a Want (or Fear) is fulfilled, the slot it occupies, and sometimes others, will be re-rolled, and a new one will take its place. Wants and Fears are also re-rolled completely at the end of the day, usually early in the morning once the Sim wakes up. Wants will often be re-rolled when a Sim visits a community lot.

Locking Wants and Fears
Wants and Fears can be locked by right-clicking them, and once locked they will be exempted from re-rolls until they are fulfilled. A Sim can normally lock only one Want or Fear, but Sims who have completed their junior year in college receive an extra Want/Fear lock.

Aspiration and Influence points
Fulfilling Wants will increase the aspiration bar by a set amount, and in many cases will also increase the influence bar. Fulfilling Fears will, similarly, decrease the aspiration bar and influence bar. Generally, the more difficult a Want is to achieve, the more aspiration and influence points you will receive for fulfilling it and the worse (more damaging) a Fear is, the more aspiration points will be lost if it is fulfilled.

Fulfilling Fears may lower the aspiration bar to the point of aspiration failure, which is to be avoided.

Aspiration points and Influence points can be used to "buy" aspiration rewards and influence options, respectively. Aspiration and Influence points are only lost when used, they do not fluctuate with the aspiration bar.

Lifetime Wants
The Sims 2: University also introduced the concept of Lifetime Wants. Prior to The Sims 2: FreeTime, fulfilling a Lifetime Want will give a Sim permanent Platinum mood for the remainder of his or her life. Beginning with FreeTime, fulfilling a Lifetime Want will give the Sim Platinum mood, but it will not be permanent, though it will decay very slowly.

Examples of Wants and Fears
Sims in different circumstances will have different Wants and Fears, appropriate to their age level. A toddler, for example, will roll up Wants to be potty trained, or taught to walk, a child Sim may fear their parents breaking up, an adult will roll up Wants to be friends with Sims around them.

Relationships with other Sims will also change Sims' Wants and Fears about them. Sims who are just becoming friends will typically fear being rejected for a simple social interaction; as the relationship progresses, this fear will be changed for a more complex interaction or fear of the Sim's death.

Similarly, Wants and Fears tend to be influenced by a Sim's aspiration: a Sim with a Knowledge aspiration will tend to want to gain skill points or maximize a skill and fear losing skill points, whereas a Romance Sim will want to WooHoo with almost everyone around them and fear marrying.

Fears can also change as various elements of a Sim's life change. For example, a Sim may fear having another child if they already have 4, or a sloppy Sim may fear changing a diaper if a baby is born.

some times a sim may actually want and fear something at the exact same time