The kiss is between two characters of the opposite sex, so the person who put the bad:kissing tag did it right, right? Because the action is done by both a male and a female. Then the e-hentai tags are not as absolutist and unique as you think. Or am I wrong?
I don't agree with the tag's definition [male:kissing should be (and is) for kissing done with only male participants, female:kissing should be (but isn't) for kissing done with only female participants, and mixed:kissing should be for everything else], but by the definition that exists male:kissing and sole male being on the same gallery is nonsense.