Should 37 be 33?

Sixty-six men, representing 37 gay male sibling pairs?

Context:

Research has generally supported the existence of familial-genetic
factors for male sexual orientation, but has not shed much light on the
specific nature of those influences. Gay men with gay brothers provide
the opportunity to examine several hypotheses. Sixty-six men,
representing 37 gay male sibling pairs, completed questionnaires
assessing behavior on various measures including childhood and adult
gender nonconformity, timing of awareness of homosexual feelings,
self-acceptance, and the quality of family relationships. Consistent
with prior findings using twins, gay brothers were similar in their
degree of childhood gender non-conformity, suggesting that this
variable may distinguish etiologically (e.g., genetically)
heterogeneous subtypes. The large majority of gay men with brothers
knew about their own homosexual feelings before they learned about
their brothers' homosexual feelings, suggesting that discovery of
brothers' homosexuality is not an important cause of male homosexuality.