I'm reading the paper "Large-scale GWAS reveals insights into the genetic architecture of same-sex sexual behavior". In Fig. 4 shows "Genetic correlations of same-sex sexual behavior with various preselected traits". This sentence confuses me. I understand that you could do a standard statistical analysis to find correlations between same-sex sexual behavior and various traits. What makes the way they are doing the correlations "genetic"?
(Note: This may be more of a statistics question than a bio question. Feel free to move it to a more relevant SE site.)