Penile volume reactions of homosexual and heterosexual males were compared, using slides of nudes of both sexes at various ages and slides of bland sexually neutral pictures. With the exception of the larger responses of the heterosexual controls to children of their preferred sex, the responses of the two groups to the various sex-age categories were comparable (no significant differences). With both groups, the responses to the various age categories of the non-preferred sex were indiscriminable from those to the neutral pictures.
In a further experiment, six stimulus categories of slides were exposed: (1) pictures of skin afflictions from a dermatological textbook, (2 and 3) two categories of neutral slides, (4) nude pubescents, and (5) nude adults of the non-preferred sex. Before exposure of these slides, subjects were prearoused with slides of adult nudes of their preferred sex.
With both groups the pictures of skin afflictions produced significantly more penile detumescence than the remaining stimulus categories. Pictures of persons of the non-preferred sex and the neutral slides were not significantly different.
The heterosexual controls rated the pictures of skin conditions as more disgusting than those of males, and the latter in turn as more disgusting than neutral pictures. The homosexual males rated the skin afflictions as more disgusting than all the other pictures, but there was no significant difference in their verbal rating of female pictures and neutral slides.
The studies did not support the hypothesis that homosexuality is a neurotic symptom.