[Solved] High levels of NO<sub>X</sub> emissions may be the result of a lean air/fuel mixture. Spouses Cheating: Refers to the act of infidelity or adultery by a married person towards their partner. Relationship Infidelities: Acts of being unfaithful or betraying a partner's trust within a romantic relationship. Cheating: Cheating involves behaving dishonestly or unfairly in order to gain an advantage, especially in a context like academics, sports, or relationships. Exotic Becomes Erotic: A theory suggesting that individuals become erotically attracted to the unfamiliar, or those who are different from themselves and their early environment.