One theory is that black-and-white photography is always more sexy than colour photography. The reason for this is provided by Marshall McLuhan, who points out that if a thing is 'high definition', which colour photography is, it provides more information and doesn't require participation as much as if it is 'low definition', i.e. a horror play on the radio is always very, very frightening because the imagery is always your own. If you err choosing your own imagery, you'll always choose the most frightening, or in the case of pornography, the most sexual.
The idea of things being low definition has always interested me a lot – of being unspecific – another thing which is a key-point of my lyrics. They must be 'low definition' so that they don't say anything at all direct.