Though the words “otoko” (men) and “onnna” (woman) are used to differentiate gender, “dannsei” (male) and “josei” (female) are more commonly used. The expressions “otoko” and “onnna” are often used in news reports. For instance, it is used to refer to persons under suspicion of having committed a crime, as in “the man (otoko) who committed the attack…” However, if you say “otoko no hito” or “onnna no hito,” they become a casual expressiong for dannsei and josei. Little children are called “otoko no ko” (boy) or “onnna no ko” (girl), but sometimes these expressions are also used to refer to teenagers. This usage is similar to that of boy or girl in English. To distinguish between genders in sports events or with students, men are referred to as dannshi and women as joshi, for instance, dannshi marathon or joshi daisei (university student). Specific terms are often used to refer to women who enjoy a particular hobby. Women who enjoy climbing while wearing fashionable gear are “yama ga-ru” (mountain girls), women who love history are “rekijo” (history women) and women who love manga about romance between young men are “fujoshi” (rotten girls). It’s thought that terms like xx ga-ru and xx joshi are used depending on how easy they are to pronounce in combination with the preceding word. There are not many expressions like these for men. This is because the words have been created to refer to women who are making advances into activities that have up until now been male dominated. In this way, Japanese people change the usage of words that distinguish sex depending on the subject.