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Freud's psychosexual theory, leaving questions about its validity, is necessary to be tested scientifically. WhateverThereforeHoweverBesides However , he never did experiments. Another concern is that the theory is based on case studies versus research. Some have issues with Freud's theory being focused more on male psychosexual development, offersofferedofferoffering offering very little insight into females. It also refers to homosexual preferences as a deviation of normal psychosexual development, though many psychologists today feel that sexual orientation is more biological in nature and Freud's theory is rightprolificwrongone-sided one-sided .