Chemistry

Turn-on and turn-offs were introduced in the "Nightlife" expansion of The Sims 2.

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. Sims with compatible turn-ons/offs will have lightning bolts in their relationship panels (maximum of 3). Sims in community lots can scope crowds to find those special Sims.

List of Turn-on/offs

 * Black Hair
 * Blond Hair
 * Brown Hair
 * Cologne/Perfume
 * Custom Hair
 * Facial Hair
 * Fatness
 * Fitness
 * Formal Wear
 * Glasses
 * Grey Hair
 * Red Hair
 * Stink
 * Swim Wear
 * Underwear
 * Vampirism
 * Werewolf (added with Pets)
 * Plantsim (added with Seasons)

Note: A later expansion pack added turn-ons/offs related to skills and careers.