A pagan worldview - i.e., the view that prevails in most of the world - will tend to approach homosexuality either by endorsing it or by saying that it might be stupid or weird, but it’s really no big deal. Only religious viewpoints (including Buddhism) - which view the world as ordered and rational - will oppose homosexuality as a serious aberration.
There are plenty non-theistic reasons to want to have nothing to do with homosexuality... disease and protection of children from rape being two big ones.