[CentOS] do i need a dedicated ip address for https?

>> http://help.godaddy.com/article/1054
>> "# Set up SSL protection on your website."
>> is it an inescapable requirement to have a dedicated [not fix] ip
>> address, when i want to use ssl on my domain?
> 
> Yes.
> 
> Reverse DNS has to be working.

Why is that? I have several ssl sites, and many of them don't have the proper ip -> name resolution setup correctly...