Some adults like childish things, I don’t think it necessarily makes them creepy. I have a friend who loves fairies and her house is full of fairy paraphernalia. She’s completely harmless and has a great life, high-respect job etc.
As a PP said, the bears aren’t engaging in explicit acts so I don’t see a problem. It’s a fun novelty gift.
Many things originally for children have been recreated for adults…adult cartoons for example like the Simpson’s with a childish art style but adult humor.