<Do you think de-criminalizing an activity amounts to endorsing that activity?>

Not sure that's the right question. Endorsing it or not involves your opinion (to which you are entitled), but just like prohibition, it has little or nothing to do with 'demand'.

Sexual markets will always be with us. They always have been, and by comparison with the past, we are relatively repressed. It makes sense to me that with legalization could come the opportunity to increase everyone's safety and health.

The problem with this, as with other things we are seeing, is that it opens the door to degeneracy. IMO children are exposed to a level of sexuality these days that is harmful because they don't get to develop on their own, their consent and timing of knowledge is removed by a permissive society. Especially now with the internet and porn, an eight-year-old with no filters can learn things I still have not figured out for myself at 72. So how to deal with that...