"Pure curiosity" refers to a strong desire or interest to learn or discover something out of genuine interest or fascination, without any other motives or intentions. Full definition
What drives the sex researchers (some of whom are openly gay) is most often pure curiosity. (discovermagazine.com)
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This is an unusual mix of almonds and cauliflower and one we had to trial out of pure curiosity! (eluxemagazine.com)