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

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

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

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What are the pros and cons of a prospective bride/groom not having any siblings?

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

Yaoi

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

“None of my business” is the common attitude.

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

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How do you see these below?

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.

Moreover, buff guys are often avoided for their narcissism.

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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.

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).

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.

What were some things that the ancient Greeks excelled at compared to the Romans?

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