The conquest mentality and “cult of virility” shaped same-sex relations. Roman men were free to enjoy sex with other males without a perceived loss of masculinity or social status, as long as they took the dominant or penetrative role.
The ancient Greeks did not conceive of sexual orientation as a social identity as modern Western societies have done. Greek society did not distinguish sexual desire or behavior by the gender of the participants, but rather by the role that each participant played in the sex act, that of active penetrator or passive penetrated.
Opposition to homosexuality in China rose in the medieval Tang dynasty, but did not become fully established until the late Qing dynasty and the Chinese Republic.