You got it backwards.
Kes was a dude that week. Kissing his male finance, which UPN would have been too dull to censor would have been a big gay kiss and just as applaudable as what happened on DS9.
If he kissed that that girl, that would be tediously vanilla & straight. Meh.
On Xena, Bruce Campbell was being soul jockeyed by Xena's ghost when "they" kissed Gabrielle which was an end around on the censors who would not let that show be the screaming handbag full of rainbows it wanted to be.