Cameron has also been criticized for placing responsibility for same-sex child sexual abuse on "homosexuals"; Scientists say someone who carries out such abuse need not have a homosexual orientation with respect to other adults. Gregory M. Herek, a psychologist specializing in prejudice against sexual minorities, charges that Cameron misrepresented the literature he had reviewed and cited to support his claims, such as a Groth and Birnbaum (1978) study in which none of the participating child molestors actually identified as homosexuals, and none of those who were bisexual claimed to prefer men over women. Furthermore, while Cameron assumed all the same-sex molestations were perpetrated by homosexuals, he did not assume all the opposite-sex molestations were perpetrated by heterosexuals; he included a "bisexual correction" only for opposite-sex molestations that effectively increased the number of perpetrators described as "homosexual" without changing the number described as "heterosexual".