Eiko met her roommate's brother Haruo, and they became good friends. Their relationship is strictly platonic. This is an example of a:

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A cross-sex friendship is a friendship between people of opposite sexes that is strictly platonic. This type of friendship is becoming increasingly common in today's society, where gender roles and expectations are changing. Propinquity refers to the physical proximity between two people, which can increase the likelihood of forming a relationship. Homogamous friendships are between people who share similar characteristics, such as age, education, and background. Mixed-gender friendships can refer to any friendship between people of different genders, regardless of whether it is romantic or platonic. A spurious relationship is one where two variables seem to be correlated, but in reality, they are not.

Eiko Met Her Roommate's Brother Haruo, and They Became Good