A 2006 research paper on IRC attacks found that users with feminine nicknames received 25 times the number of malicious private messages as users with masculine nicknames. The feminine usernames received a total of 100 malicious private messages per day, on average - without saying anything! Ambiguous nicknames received 5 times the number of malicious private messages as masculine nicknames. It's likely that a user with a masculine or ambiguous nickname who reveals they are female in some other way will get similar treatment.