Homosexual are those person that romantically attracted to the same sex/gender. Like if you are a girl you are possible that doesn't attracted to your opposite sex/boy it is because you are more attracted to other girl that you think is beautiful and can be a good companion if you go out with friends. It can be also happen not only to girls but also to the boys that they are more attracted to other boys that more masculine and have good charm rather than to a sexy girl with a beautiful smile.
While homosexuality is romantic attraction, sexual attraction, or sexual behavior between members of the same sex or gender. As a sexual orientation, homosexuality is ""an enduring pattern of emotional, romantic, and/or sexual attractions"" to people of the same sex.