Because... what? It isnt in the BOR??
Your a DEMOCRAT if you believe such bunk. You could equally outlaw ANYTHING as long as it isn't "offensive to the specifics of the BOR".
Does the BOR give you the right to procreate? To kiss anyone? To practice acupuncture? To grow a garden? Play paintball?
The ONLY WAY to make consistant law is to recognise rights (limits on the scope of what can be done to protect people). I could claim your video game (religion/sport) makes kids violent.
Too bad. Since there is no scientific or logical method of determining this mythical DEGREE of "endangerment" that you want to use as THE LINE that allows government intervention, you must use rights.
If you use "Democracy" to do so, you are advocating nothing more than "popular tyranny".
Even if there was such a method, it would be repugnant to the individual because it statisticizes an activity (guilt by grouping people by activity).
Your argument against prostitution, since it assumes harm, would have to ALLOW a form of prostitution that did not cause such harm (high class prostitution).
Or do you assume, like a demoncrat does, that you can outlaw whatever activity is repugnant to you?
Perhaps you should go back to an older thread to learn.