I agree with Raina
I agree with Raina. As a fellow Minnesotan, where it's cold and there is little to do besides sex in the winter, it is important to take precautions for one's health and the health of those around you. While my doctor did state that it is actually difficult for a person with a fully functioning immune system to contract HIV, getting tested is easy. And as a guy you needn't be embarassed. Just walk right in and say "I' ve been gettin' so much tail lately...unbelievable really...that I am worried about winding up another Magic Johnson." They'll all high-five you and line up to swab your tounge!!
Now Raina, when you talk about multiple partners, are you talking about all at once or one after another? Things can get wild in my igloo, but you sound totally crazy.
In all seriousness, get tested. It is the person you least expect who infects you with something bad.