There is an awkward thing which much perplexes,
Unless like wise Tiresias we had proved
By turns the difference of the several sexes;
Neither can show quite how they would be loved
The sensual for a short time but connects us,
The sentimental boasts to be unmoved;
But both together form a kind of centaur,
Upon whose back 't is better not to venture.

Byron, Lord (1819-1824). Don Juan.