A Unified Quantum Theory of the Sexual Interaction
In the simplest theories of the sexual interaction, the eigenstates of the Hamiltonian describing all allowed forms of two-body coupling are identified with the conventional gender states, “Male” and “Female” denoted |M> and |F> in the Dirac bra-ket notation; note that the bra is superfluous in this context so, as usual, we dispense with it at the outset. Interactions between |M> and |F> states are assumed to be attractive while those between |M> and |M> or |F> and |F> are supposed either to be repulsive or, in some theories, entirely forbidden.
The treatment, however, is incomplete. There is no mention of the difficulty of describing an interaction in the dressed-state picture. Nor any analysis showing that M-F coupling with aligned spins may, with some probability, be equivalent to applying the creation operator (clearly, these are bosons), while in interactions with spins anti-aligned, this does not happen; both interactions usually occur with both particles in an excited state.