“What’s interesting about this work is even among a group of individuals who are pretty similar in terms of their sexual preference-that is, gay men preferring men-there could be a diverse set of processes that lead them to exhibit that same sexual orientation outcome,” study author Doug P. Whether any of these factors is based in biology is hard to pin down: A man who grew up among more women may feel more comfortable expressing what is stereotyped as a “feminine” sex role. There was also a correlation between between being versatile and having older sisters. The studies also found that non-right-handed men were more likely to be bottoms in actual practice rather than personal preference, while fraternal birth order was more linked to preference. While the survey found bottoms identified as being more gender-nonconforming, they were also more likely to be left-handed and to have more older brothers. They were further questioned about how gender-conforming they were as children, whether they were left or right handed, and the number and type of siblings they had.
