I couldn't figure out why the hell else anybody would deny that substance abstinence, sexual selectivity, et cetera are (relatively speaking) 'conservative' behaviors, so yes.
I'll admit that I shouldn't have said that thing about politics in that thread. However, I still don't think there's anything inherently "conservative" in a political or non-political sense about refraining from those behaviors. "Conservative" generally implies that there's some sort of return to the past or to the status quo, which I'm not really seeing here.
I think when it's used in contexts like this it's meant in the sense of 'risk-averse' or 'cautious' (the latter being the first definition Wiktionary gives for 'conservative' as an adjective).
True The vast majority of the time I (and others) use conservative in a conversation, it's using the cautious/risk-averse definition and wholly unrelated to politics.