Generally, romantic and sexual attraction are not joined together in the teen stage - although some confuse the two.
Men love for a variety of different reasons. But men do not have sex with everyone they love. Healthy men love both men and women, but control their sexual urges. In a healthy society, they have sex only with their wives.
Boys have fantasies. In normal development, they will be guided not to give in to their fantasies, but to channel their thoughts into constructive patterns. Some people don't develop normally and their fantasies rule their lives. (Not all of those are homosexual.)
Homosexuality is not a constructive pattern, and boys should be discouraged from channeling their thoughts in that direction.
Shalom.