The concept that transsexuals with homosexual and non-homosexual sexual orientations are etiologically different has a long history in this field. However the terms used have not always been agreed on. Some scientists working on the topic have criticized the practice of categorizing transsexuals by sexual orientation and sex at birth. In the words of Benjamin, male-to-female transsexuals can only be homosexual if anatomy alone is considered, and the psyche of MTF transsexuals is ignored. According to him, after SRS, calling a male-to-female transsexual "homosexual" is pedantic. He opined that the question "is a transsexual homosexual?" had both "yes" and "no" answers depending on whether sexual anatomy or gender identity was prioritised, and that in cases of post-operative male-to-female transsexuals, describing them as "homosexual men" was against "reason and common sense". When Benjamin was writing, "transsexual" implied male-to-female, and attracted to men. For a time in the 1980s terms which SJ Wahng describes as "homosexual transsexual" were in the DSM-III-R (transsexual, homosexual subtype) The DSM-IV and DSM-IV-TR stipulated that the sex a transsexual is attracted to be specified as "attracted to males, females, both or neither".