I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "Some researchers, such as Bruce Bagemihl, have criticized the labels "heterosexual" and "homosexual" as confusing and degrading. Bagemihl writes, "...the point of reference for 'heterosexual' or 'homosexual' orientation in this nomenclature is solely the individual's genetic sex prior to reassignment (see for example, Blanchard et al. 1987, Coleman and Bockting, 1988, Blanchard, 1989). These labels thereby ignore the individual's personal sense of gender identity taking precedence over biological sex, rather than the other way around." Bagemihl goes on to take issue with the way this terminology makes it easy to claim transsexuals are really homosexual males seeking to escape from stigma."? 

Heterosexual and homosexual preferences are both types of sexual what?