作为一名坚定的单一配偶主义者，她拒绝任何形式的开放关系。

As a firm ___monogamist, she rejects any form of open relationship.

作为一个一夫一妻主义者，他始终忠于自己的婚姻誓言。

As a ___monogamist, he has always been faithful to his marriage vows.