境遇性性行为（Situational sexual behavior），是指由于受到特殊的社会环境默许、鼓励或迫使，使得人们进行了不同于自己所认同的（或通常表现出来的）性行为的一种现象。
英语百科
Situational sexual behavior 境遇性性行为
（重定向自Situational homosexuality）
Situational sexual behavior is sexual behavior that is different from that which the person normally exhibits, due to a social environment that in some way permits, encourages, or compels the behavior. This can also include situations where a person's usual sexual behavior may not be possible, so rather than not engaging in sexual activity at all, they may engage in different sexual behaviors.