Alloiophilia is a sexual orientation denoted by an attraction to the opposite sex. In other words, it is a synonym for the more commonly used word, heterosexuality.
Alloiophilia is a combination of the Greek words alloio, meaning “differ or dissimilarity,” and philia, meaning liking or love. Putting these words together, alloiophilia translates to a liking or love for people who are dissimilar, specifically in terms of gender.