The laws vary by state, but for the most part we don't criminalize STDs as a society nor do we criminalize behaviors just because we don't agree with them (even if they are blatantly stupid behaviors). Most public health law is built around educating people and preventing the spread of disease to the unsuspecting. If someone is consciously making a choice, there's no law that would punish those who make the choice for whatever reason.
Look at my post # 5 wherein I point to other instances in which we criminalize self injuring activities. Laws making it unlawful to infect someone are not likely to make an exception for consensual infection.


















