All of the dating web site require you to have a login name.  This name is used in all communications between the site and any prospective match.  And, sometimes a login name can give you a lot of insight into the person using it.

For example, when I see logins like “ihatemen” or “menareworthless”  I am thinking that this is a person with an attitude.  Now, while such names might be funny to some women and their girlfriends, they are not funny to men.  And, unless I am mistaken, the whole purpose of being on these sites is to attract men, not make sport of them.

Maybe that is why they are still single in the first place.