The best replacement for flirty is dirty.

The best alternatives to flirty are rated as following:
★★★★★  dirty
★★★★★  friendly
★★★  else what comebacks
★★  just friendly

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Speaking about flirty, one probably shouldn't forget about forty.

Other search terms related to flirty and their ratings are:
★★★★★ forty
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Google Trends

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flirty
dirty
friendly