Answer :
Answer: A group of young adults who believe in complete celibacy for both sexes.
Explanation:
The Junior Anti-Sex League is a group of young adults who believe in complete celibacy for both sexes. They wear red sashes to show that they are celibate and loyal to the Party. When Orwell mentions the Junior Anti-Sex League it is usually to emphasize someone's support, or supposed support, for the Party.