Bg is the abbreviation of "boy and girl", which originated from and is mostly used in animation field. It means love between men and women, and people usually call it "gender orientation".
BG, which is usually seen on the Internet, is actually a cartoon from Japan, usually followed by the word fan, which refers to the cartoon (or novel) of men and women in love, that is, "Boy&; Girl. In contrast, there are BL (love for boys) and GL (love for girls), both of which belong to the same human works.
The correlation is as follows:
BL refers to a novel about love between men and women.
BL is the abbreviation of Boys‘Love, which is translated into Chinese. It is the love between boys (referring to the love between men, but not exactly the same as gay men). It is also called juvenile love in ancient times. In the Japanese comic circle, there is a special BL comic school.
BL mostly belongs to the same-sex love between men in female fantasy, which is simply fantasy, daydream, beauty and fantasy, and it is the love relationship between two men in people's fantasy.
The main audience of early BL works is women (referred to as rotten women). The word "rotten girl" originated from Japanese and was transformed from the homonym "fujoshi", and was later fascinated by gay men and bisexuals.