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Sample size of 18 and 'on average'. Scienceclickbait, you don't miss anything spectacular by skipping this article.

Digit ratio is actually a very well studied effect. Hundreds of studies have been done on it.

The wiki page references at least 10-15 studies discussing its correlation with sexual orientation.

I can't figure out why this is news. What am I missing?

That's a very dismissive attitude. There are limitations with the study, but the methodology is sound.