It is not abnormal. It existed thousands of years ago and still exists today.
Heck even some animals have homosexual tendencies and yet they are physically normal as every homosexual man or woman.
Like I said, the act is no one's bussiness but the persons involved in it.
It's like in the 1800's. Black people, asian people, latin american people were called inferior adn physically abnormal. It seems hate has transported itself from nationality issues to sexual orientation issues.