sorry but the diagnostic manuals mental disorders, sexual preferences have been removed and "gender dysphoria" as pathologies, because of the cultural change that society itself has been forced to ease their cognitive distortions. When you talk about "sex" This word is very ambiguous when referring to sexuality and gender, there is a universe inside, I'll explain it another way, if you say sex: anyone can think that you mean the gender (male or female) but , also to sexual exercise (to have intimacy). Psychology is a very sensitive issue to make assertions especially when we do not look for specialized sources. In fact if you notice your sources are from 93, when we made informative articles we should consider sources with data no more than 5 years old because many contributions are no longer valid (especially when we are not specialists), there is a book from the Mediterranean publishing house that is called about homosexuality and they carry out a review of more than 250 specialists, both neurologists, immunologists, pediatricians, sociologists, psychologists, historians and more. This book begins with the right concepts to understand that it is a sexual preference with these: identity of gender, nuclear identity. On the other hand, considering adolescence as a stage to generalize parameters is not ideal either, because up to the age of 21, individuals have not fully developed the personality bases, from there until age 21, "homosexual" behaviors are part of of the discovery of his personality. My apologies for the suggestions but I am a specialist in the area and it has been a lot of times to educate about this topic