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

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

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).

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

Do you have any problem dating a younger man?

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

Visual-kei

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

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How do you see these below?

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

Moreover, buff guys are often avoided for their narcissism.

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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.

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

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.

Our sister died because of our mum's cancer conspiracy theories, say brothers - BBC

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

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.

Yaoi

Beautiful European women were killed by inquisition but Russia was not Catholic. Is this the reason for a drastic difference explaining why Russian women are the prettiest?

“None of my business” is the common attitude.