I'm so sorry your husband is behaving like this. He is totally caught up in the NRE, and his desire for the teenagers is a bit disturbing. His demands are offputting for sure. My gut reaction would be to walk away and let him do his thing, and maybe he'll recover his from his NRE-induced fog and come back begging for forgiveness.
But I know that's much easier said than done when you've invested a huge chunk of your life and emotional energy into someone you truly love. I'm in a somewhat similar position myself. Is there any way you could get him into some marriage counselling? Sometimes that disinterested third-party can get someone to begin thinking of the serious repercussions of their actions, and can sometimes cause the serious introspection that can help cut through the NRE fog.