What would be the most commonly used and understood term for copulation? (i.e sex)


I know there are a lot of ways to say it, but what is the most commonly used
form?




セックス is the most direct word for it. It's likely not the most scientific way
to describe it, but using セックス in any circumstance would make sense.

In Osaka, I've also heard people (particularly college students) say えっち as
well. However, it's considered slang, and it doesn't quite mean the same
thing.

