You might be interested in some threads from the FAQ sections on "Historical views on homosexuality":

Rome and Homosexuality.

• How did homosexuality go from something that was accepted in (Greco-Roman world) to abhorrent (under the Abrahamic religions)? - 11 comments, over 2 years old.
• The comments here give a summary of and discuss Roman definitions and attitudes towards sexuality.
• What was it like being gay in ancient Rome? How socially acceptable did the Romans view it? - 19 comments, over 2 years old.
• An archeologist chimes in about Roman material culture surrounding sexuality and a comment further down deals with the Roman attitude towards sexuality in general.
• When did homosexuality become taboo in society? - 125 comments, over 2 years old.
• Go a bit further down to find comments dealing with Roman concepts of sexuality both before and after the rise of Christianity in the Roman Empire.
• What is the historical viewpoint on homosexuality? - 10 comments, over 2 years old.
• The commenters in this thread discuss the theoretical aspects of modern homosexual identity and contrast it with sexuality in the pre-modern world.

General Historical Sexuality

• Wednesday AMA: I am heyheymse, specialist in Roman sexuality and mod of this fine community! AMA. - 200 comments, over 2 years old.
• The OP hits a few points on homosexuality in the Roman Empire but mostly deals with other aspects of Roman sexuality.
• AskHistorians AMA Thread: History of Sexuality - 344 comments, over 1 year old.
• Many specialists from across fields participated in this AMA and provided valuable background material for those with questions about historical sexuality even if it's not specifically about homosexuality.