Should it be a crime not to? 
There's a lot of good arguments on both sides. IMHO people need to treat sexual relationships like driving: Drive safely and protect yourself (i.e. demand protection be used with new partners, stay sober) and assume that other people are going to do something dangerous and/or unpredictable. The biggest problem with STDs and HIV is that many times people put themselves in situations where they're too intoxicated/under influence to make safe decisions in regards sexual activity, use protection, let alone make disclosures like this. Unless there is a specific intent to infect people with HIV, I have a hard time deciding whether or not a failure to disclose constitutes an actual crime, however. People IMHO need to be better educated about HIV/STDs, stay sober, and protect themselves better when it comes to sexual relationships. People should be honest too but it's impossible IMHO to assure that everybody is being honest about everything at all times, unfortunately.
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