The Sociologist Peter Bearman Asserted That

The sociologist Peter Bearman asserted that:

A) since males with female twins are less likely to report same-sex attractions than other males are, having a female sibling the same age provides a model for an "ideal sexual partner" and demonstrates that social factors influence sexual orientation
B) since males with female twins are equally likely to report same-sex attractions as other males are, social factors do not influence sexual orientation
C) since males with female twins are about twice as likely to report same-sex attractions than other males are, the parents of opposite-sex twins are more likely to give them unisex treatment, which leads to a less traditionally masculine influence on the males, and this demonstrates that social factors influence sexual orientation
D) due to the wide diversity and sheer number of influences on sexual orientation, no reliable conclusions can be drawn from studies of twins
E) due to the extreme difficulty associated with isolating social factors, only studies on identical twins are able to shed light on factors influencing sexual orientation, and in order to be reliable, they must concentrate on biological and genetic components only