Suitors, also called Erotic DoctorBots, were manufactured by Suitors, Inc. They were identical in appearance to the Fourth Doctor and were programmed not only for housework but also for "wooing and courting and...what not", according to Maude.
Suitors, Inc. was run by Iris Wildthyme, who was actually working for Madame Binky. The Suitors were part of a plan to capture elderly human women and bring them to Pussyworld.
There was also a version of Suitor that resembled the Third Doctor and was programmed for fighting. (PROSE: Suitors, Inc.)