i'm assuming you're mistaking what i said, so i'm going to rephrase it with some more words this time.
i agreed that the test wants to know your love, not your gender. however, the context of the question is to know more about your mentality and personality. thus, what i am assuming the test is then doing, is taking your love in account by the way you behave differently as female than as male, and vice-versa. by this reasoning, your genitalia is irrelevant, as opposed to how your different love can alter your experiences, personality, and mentality as opposed to someone of the opposite love.
i have a .edu source for you that is cited by 558 other articles and is generally pretty noteworthy. it's a research from 1991 about how different lovees are expected to behave differently, and how it alters their way of thinking:
http://www.li.suu.edu/library/circulation/Gurung/soc2370sgLorberSocialConstructionOfGenderFall11.pdfanother researcher: richard j. haier, has done a lot of research in this particular field as well, here is a .pdf that focuses more on the mental differences
https://haier.squarespace.com/s/cognition-and-the-brain.pdfhe has more articles on his website
http://www.richardhaier.com/articles/love-differences/generally, love differences is a heavily touched on subject in many factors, and itself is too broad to answer with one article. there are plenty more that document how both lovees act along with mental illness such as depression, how both lovees handle sports, how both lovees handle love drive, et cetera.