Simplify the following text for a Grade 6 native English-speaking person.
Original: Many of his other conjectures , particularly about hidden sexual themes ( e.g. images of female nudity concealed in drawings of muscles and tree bark , or Batman and Robin as gay partners ) , were met with derision within the comics industry .
Simplified: Wertham thought he saw hidden sexual themes in comics such as nude women hidden in drawings of muscles and tree bark . He also thought Batman and Robin were gay partners .