[Toby]

It all depends on what keywords you are trying to rank for...

If you're selling snow globes, then a backlink and ranking for the phrase gummy bears may lead to some additional traffic, but it's not likely to sell more snow globes. However, a backlink from the phrase decorative collectibles might give a bit better result.

I don't really think adult vs non-adult is at all significant as long as the target key phrase is at least semi-related to the content on the destination site.