It's not actually illegal everywhere in the US, for example, prostitution is legal in some counties in Nevada. The main reason though is that there are too many

It's not actually illegal everywhere in the US, for example, prostitution is legal in some counties in Nevada. The main reason though is that there are too many religious pundits. Don't try to find logic in this. Some things are even stranger: in Washington state it's legal to go to casino, but it's illegal to gamble online.