Friend of mine says something like the prevalence of homosexuality in the Roman and Greek civilizations demonstrates this as a matter of choice. Why has it not been constant and as highly practiced as in the days of those civilizations?
My friend mentioned the “Greek Civilization”, that may be more on point, see article: http://www.conservapedia.com/Greek_Homosexuality . All the same, we can learn from the ancients on this matter: http://www.conservapedia.com/Roman_Homosexuality