There is a Feature on the Chat called Ignore. If you add a Member to the Ignore List while in Chat you'll never see another Chat Message from that Member. So if they try to respond to you, you'll never see it.
There are some girls that have a skill when it comes to performing their Solemn Duty.
Enjoy it while you can. Someday as the aging process rolls along they'll be at the stage where it becomes necessary to Gum it.
Guests are just Lurkers that observe the Forum. I believe they can only view a certain amount of Topics before they get a Pop Up showing they have reached their Daily Limit and will not be able to view any further until 24 Hours has passed or they can Create an Account to Continue Reading.
Anonymous is just Members who have signed in but they Appear Offline so they are not seen by anyone. It's just a preference some Members prefer.