Fifteen years ago we proposed that the diagnosis and treatment of sexual an
d other problems could be delivered in a professional and expert manner usi
ng personal computers. We programmed a sex-expert diagnostic and treatment
system and tested it on several hundred individuals and couples in the labo
ratory, as well as on a pre-Internet regional computer network. Although th
e results of our studies were very encouraging, a lack of scientific intere
st at the time prevented further research being undertaken. Recently, the g
rowth of the Internet has lead to the development and use of a number of on
line approaches to the delivery of psychotherapeutic services in general, a
nd of some new approaches to sex therapy in particular. However, a number o
f scientific and professional issues need to be investigated if the public
health potential of the provision of online psychotherapy services is to be
realized.