Thomasina ponders the topic under discussion with amusement, thinks to argue for the third option, then stops, thinking it would not be proper to use her relations as examples in this discussion, then hits upon the idea of speaking on the subject of Cleopatra, I do not know what a biochemical state is, but if it has anything to do with developing urges to kiss or embrace or otherwise make love to another person, then I should think Cleopatra would be a good enough case on which to base an argument for that point of view. Poetry, after all, is not all psalms - and whilst lovers often praise the virtue of their loves, they are more likely to count lips or eyes or hair among them than chastity or prudence.