Boyfriend's a person's regular male companion in a romantic or sexual relationship, which falls short of a long-term committed (eg. marital) relationship. On the other hand, the term "boy friend" (or more commonly "guy friend") can refer to a male non-romantic and non-sexual friend. Scope The term's most commonly used to describe any male person who's in a romantic relationship with another person. Partners in such non-marital relationships are also sometimes described as a significant other,… (More on Boyfriend)