Sent_en: 2zh Boegart reasoned that if the link between homosexuality and elder brothers was due to the nurturing effects of the family environment it would show regardless of any biological relationship.
Sent_yy: 博格特解释说，如果同性恋和哥哥之间的联系是由于家庭环境的养育效应形成的，那么无论他们是否为亲生关系，同性恋都会表现出来。