Will he ever stop humping?

When he first came to our little home, my puppy was an angel. He would cuddle with us, lick our feet, and play nicely. He didn't even bite.

But he's growing, and now he's acting like an old pervert. I don't know how much humping is normal. Should I stop him? If it's just a phase, I can try to ignore it, but if it isn't, I don't know what to do.

He humps his toys and his blanket. Recently, he tried to hump my arm while I was lying down. It's getting scary.

I'm so lost on this topic. Any tips or help would be appreciated.