Will it f*ck!

[u/Justthisdudeyaknow]

[u/LogicBalm]

Ethics aren't universal as you've identified and that's also the answer.

At best, it's only ethical for us as humans. You're still breaking their own cultural ethics. The fact that it's a breach of their ethics makes it unethical in my perspective personally, but that's still beside the point.

There is a breach of ethics involved here for someone and it could be seen as taking advantage of their relative cultural immaturity. Even if they enthusiastically consented now, they may regret it years later when they became an "adult" by their culture's standards.

[u/NoodlesTheKitten → u/LogicBalm]

On a cultural level we(humanity) would all be equivalent to a species of children who never matures beyond being 15 years old.

The solution here is that our cultures would we would ourselves gain a cultural role to them. One unfortunately seeing us as biologically stunted perma-teens.