Mike, I am personally also someone who is very interested in sex and like to discuss it with others, and I've never been concerned that I have an addiction issue with it. It's just something that has always interested me in life. As you can see from the number of responses and the passion behind many of the responses, not only sex addiction but the whole topic of sexuality is one of the most controversial topics and one that people don't only tend to jump on but also often rip apart. Like others said, all sorts of cultural and personal differences, it's clearly not welcome in a very general way, 21st century of not.
If you are interested in a mental health related forum where you can discuss various aspects of the topic (in a lot of detail) with a large diverse crowd of people in similar ways to how interactions here on SR go (including anonymously), you can also PM me and I'll send you a link.