How conservative the Japanese people really is? And the government?

They don’t have the so-called “couple culture” seen in many Western countries.

In the old era, gay relationships were very common and were even praised among the privileged social classes, such as Samurai and monks.

“None of my business” is the common attitude.

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It’s very common for a girl/ woman to ask a boy/ man to be her boyfriend.

They were very similar to the bromance of today but accompanied by sexual intercourse.

Yaoi

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They don’t have the value that “guys must be macho.”

I’ve heard it’s always the male side that is expected to take a move in some countries. It’s not the case in Japan.

I sometimes feel people from the West are obsessed with those “gender” and “sex” things too much. Let’s think about something else sometimes. It’s unhealthy.

Why am I so jealous towards couples? Why am I tired of being single and feel my life is over?

Visual-kei

Moreover, buff guys are often avoided for their narcissism.

This is a very vague question. But considering the asker’s comment on Mr. Nakajima’s answer, your interest seems to be in sex-related matters (I don’t think it’s the only indicator of conservative/ progressive, though).

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We don’t instantly tie it with sex when a father and his very young daughter are taking a bath together.

How do you see these below?

They don’t bring around their mates everywhere, which means they don’t worry about being single, gay, or whatever because no one cares about whom others are having/ not having sex with.

Why am I attracted to older men?

They don’t tease or beat up cross-dressed people on the road.