ok did a quick google search
Bishōnen (美少年, literally, "beautiful boy") is a specific Japanese aesthetic concept of the ideally beautiful young man. The prefix bi- (美) specifically refers to feminine beauty (bijin, lit. "beautiful person", refers to a beautiful woman.) The bishōnen is typically quite slender and not very muscular, with a tapered chin, stylish hair, and an overall effeminate or androgynous appearance. ...
en.wikipedia.org/wiki/Bishonen
Bishōjo (美少女; literally, "beautiful young girl"), often spelled bishoujo, is the Japanese term used to refer to pretty girls, usually below college age.
en.wikipedia.org/wiki/Bishoujo
ok hope that helps