Step 01 · Baseline
The ratio goes first.
Sexual orientation isn't a choice — it's a developmental signature.
What the meta-analysis shows
A 2025 meta-analysis of 227,648 participants found gay men have a significantly lower 2D:4D ratio on the right hand than straight men — a marker laid down in utero.1
How old are you?
32yrs
18 yrs80 yrs
Where are you today?
Full references — see the science