In the clip they are lovers, but they're not actually kissing romantically. They are stuck in a room where the non-reptilian woman can't breathe and she is providing her with oxygen. Aside from how specious that is scientifically, it's not actually even a kiss. I think it may more have to do with conservatives not being comfortable with women expressing power over their own sexuality in that one uses the phrase "my love" to the other. Judging by internet searchings, republicans clearly don't have a problem with lesbian porn... lesbian love however... for some reason sets them off. 
An interesting question would also be, why do humans kiss? What's so special about that? How did it evolve? Many animals nuzzle each other, but I can't think of instances of actual kissing outside the human species. Hmm... 
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