About the combined analysis of GSTT1 and CYP19A1 genotypes (Table 10), we observed a significant association with female infertility in carriers of the mutated alleles of CYP19A1 even if GSTT1 is present (OR 9.143; 95% CI (4.752–17.591; p < 0.001), as well as it was also verified a significant association with female infertility with GSTT1 deletion (OR 17,267; 95% CI (7.366–40.476; p < 0.001) and for women with both CYP19A1 and GSTT1 mutations (OR 24,150; 95% CI (11.148–52.317; p < 0.00). The gene discussed is CYP19A1; the disease is female infertility.