rawTOP, I agree with the concept of some sort of expiration date on HIV-negative status. However, I think that you are giving guys too much credit when you change the expiration date based on their self-professed status as top/bottom/vers. We all know that there are a lot of guys who don't like to admit to being a bottom -- this especially frustrating to those of us who would prefer to bottom. I am generally list myself as versatile -- I would prefer to bottom, and when I do search profiles on BBRT, I pretty much exclusively search for tops or vers tops -- I rarely even talk to versatile guys -- nonetheless, in the last 3 years 90% of the time I end up topping, because when I show up to meet this guy who claims to be a total top, he ends up deciding that he's "curious" about bottoming -- and strangely, the "tops" who are "curious" about bottoming always end up wanting me to cum in them (and I am a big cummer). Those guys should not be getting test LESS often just because they claim to be a top. But I think most bottoms out there will tell you that the number of true tops out there is much less than half of the number of professed tops.
I will also point out that the actual tops in my life seem to all just want blown, but everyone I've been with who wanted to blow me ended up wanting me to cum in their ass. So, even though I would prefer to bottom, over the past 3 years I have bottomed exactly 3 times (unfortunately, twice with a condom) but I have came in a large number of guys.
Finally, I can point you to a "straight" guy on BBRT who bottoms less than once a month, but EVERY time I have seen him on BBRT looking for tops he's traveling to one of 10 cities for work and is setting up a gangbang where he's the bototm. So, he only bottoms once a month, but his parties that I've been to each had 10-20 tops.
So, why should my negative status expire sooner (based on my bottoming once a year) than the status of the "tops" out there who are bottoming much more than I am but just don't want to admit that they are a bottom? For a large number of guys out there, there is a coming out process as a bottom beyond just coming out as gay. I would strongly suggest you set the same expiration period for everyone regardless of what they call themselves.
One other suggestion that I would make . . . perhaps put some status for other STDs -- or at least the STDs (like herpes) that don't go away. As a guy with herpes, I will tell you that I serosort because 12 years ago I gave herpes to a guy who had HIV -- we had talked about it and he was OK with the risk because I have never had an outbreak (just a doctor who was insistant on testing everyone) -- a few months later the guy ended up in the hospital for 2 weeks with no feeling his legs because the herpes virus has flared up in his spine. I will also tell you that guys on BBRT who are "pos friendly" are freaked out when I mention the herpes (even though I've never had an outbreak and I have been taking Valtrex daily for over 11 years -- though I still have to disclose it because 1/2 of the guys who herpes don't know it and 3/4 of the people with herpes get it from someone who is showing no symptoms). So, for someone like me, it would be great if you would allow me to list that status, so that I didn't have to go through the "fun" of talking with a guy and thinking I was going to get to bottom for him only to have him change his mind when the herpes talk comes up.