first of all Homosexuality was practised well before the Greeks hence the term
Sodomy as in Sodom and Gommrah less then 1000 years after Adam and Eve. Secondly you say that there is all this fruitless sex and everyone is doing so isn't homosexuality okay as well? The answer is no both are not right at all. That is now the bible describes God's intended design of us and our sexual pleasures. Also seek the figures, statisics for violence in lesbian relationships is staggering when compared to hetrosexual relationships and the health consequences for gays is well documented.
I hope I do not appear judgemental although I probably am. God does love all and we are not to judge but people should be made aware of the scriptures say not bowing down to whatever society of the day saids and compromsing according to those values.