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“White European heterosexual men and women were asked to choose their own and ideal face shape…” It’s the 5th sentence.

Yep, point being it should be part of the title, as that's the degree to which it impacts results, and the title is what has the biggest impact.

No. The title is the title, not the context. If people do not read the first 5 sentences of the introduction, you cannot help anyway.