As you can see, there are three circles. The top is for poly or monogamous. The right circle is straight, bisexual, gay, or lesbian, and the bottom circle is available, involved-available, or involved-not available. The circles are color coded so that people who are familiar with the buttons can read them with a quick glance.
What are they for? They are excellent for any situation in which it would benefit you for people not to need to guess your dating status. Poly is all about communication, and this is just one more form of it. It avoids the awkward situation of someone discovering too late that you are poly or unavailable or gay or straight or whatever, and it generally makes the interaction smoother. The button itself is often a great conversation starter as well.
The Dating Status Button website has been expanded. By popular demand, it now includes buttons which say "top", "bottom", "switch", and "vanilla". The site also now includes an expanding selection of humor buttons.
As always, you can find an image of the button appropriate to you to post on your LJ or other website on the site.
My Dating Status Button says:|
Polyamorous, Straight, Involved/Available
|Polyamorous||Interested in multiple serious relationships.|
|Straight||Interested only in the opposite gender.|
|Involved/Available||Currently in a relationship, and potentially interested in more.|