How Suggestions Are Ranked
How are the suggestions shown ranked? Are the more popular searches listed above others? No. Popularity is a factor, but some less popular searches might be shown above more popular ones, if Google deems them more relevant, the company says. 

So according to this, Rizzoli & Isles being gay can more relevant than Rizzoli & Isles being lovers. Bottom line: Rizzoli & Isles is gay. Google ships it.