Chemistry

Chemistry was introduced in the Nightlife expansion of The Sims 2. It is present in all expansion packs and stuff packs released after Nightlife.

Until the introduction of chemistry, Sims were attracted to each other fairly easily. Only a massive divergence of interests would harm two Sims' relationships, but even that could be overcome with a bit of work.

Chemistry changes that. Although love can still blossom under any circumstances with enough effort, Sims now get two turn-ons and one turn-off from a limited list. If two Sims match up, they will have positive chemistry. This will make certain social interactions available earlier in the relationship, and make it easier for all interactions to pass. Conversely, if two Sims are incompatible, they will have negative chemistry, and actions will fail more often.

Each teen, adult and elder Sim has two turn-ons and one turn-off. Turn-ons and turn-offs are designed to make relationships easier (or harder) to achieve. The chemistry between two Sims can also be affected by factors such as their aspirations and Zodiac signs. Sims with compatible chemistry will have lightning bolts in their relationship panels (maximum of 3). Sims on community lots can scope crowds to find those special Sims.

Sims made before Nightlife get a potion called the ReNuYu Porta-Chug, which allows the Sim to change their turn-ons and turn-off, so they are not locked into randomly chosen ones.

Turn-ons and turn-offs can also be changed by using the ReNuYuSenso Orb, which is an aspiration reward. If University is installed, college Sims can change their turn-ons and turn-off, as well as their aspiration, when they finish their Sophomore year. A Sim's turn-ons and turn-off can also be changed with SimPE.

If changes to a Sim's turn-ons, turn-off, or aspiration would affect his or her chemistry with another Sim, the changes may not appear until the next time the two meet face-to-face.

Family members who have strong chemistry with one another will want to be near one another. This can cause results such as a Sim overlooking a nearby kitchen sink in order to wash dishes in the bathroom, because a Sim they have chemistry with is in the bathroom.

It is not possible to select chemistry based on gender, age, or skin color. However, it is possible to indirectly select a chemistry for gender by making the Sim like or dislike make-up and/or beards, and Sims can be made to dislike/like elder Sims by selecting grey hair. Gender preference also plays a role in chemistry. Once a Sim's preference for a gender becomes negative, the Sim will not have chemistry for members of that gender.

Turn-ons and Turn-offs are not the only contributors to Sim chemistry. Other compatibility factors include Zodiac sign, personality points, and aspiration. If two Sims with negative chemistry fall in love, get engaged/married, or go steady, their chemistry points will be increased to zero. If two Sims with negative chemistry develop a long term relationship of 70, their chemistry points will be increased to zero the next time they interact face-to-face. A Sim's chemistry with everyone can be temporarily increased by the love potion. Some other expansion packs add ways to increase chemistry. Seasons has the Beauty Cocktail. Bon Voyage has the vacation benefit "Je Ne Sais Quoi", and being on Twikkii Island will also slightly increase a Sim's attractiveness. With FreeTime, Sims can wish for Beauty from the genie, and Sims whose primary or secondary aspiration is Romance can get the "Massive Attraction" aspiration benefit.

List of Turn-on/offs

 * Hair
 * Black, Blond, Brown, Red, Grey, Custom, Facial Hair


 * Clothing
 * Swim Wear, Underwear, Formal Wear


 * Accessories
 * Glasses, Hats, Jewelry (Must have Bon Voyage or newer EP)


 * Makeup
 * Makeup, Full face make-up


 * Fitness
 * Fat, Fit


 * Smell
 * Cologne, Stink


 * Life state (Must have associated expansion pack)
 * Vampirism
 * Lycanthropy, Plantsimism, Zombiism, Robots (Must also have Bon Voyage or newer EP)
 * Witchiness (Must also have Apartment Life)


 * Good at Skill (Must have Bon Voyage or FreeTime)
 * Cooking, Cleaning, Creativity, Body, Logic, Charisma, Mechanical


 * Employment (Must have Bon Voyage or newer EP)
 * Unemployed, Hard Worker

Chimie