Beast in Space (1980)

In the future the struggle for space superiority has forced humanity to search the cosmos for a rare element called Antallum that is the key ingredient for the construction of neutron bombs. Starship captain Larry Madison and his crew are assigned to retrieve Antallum from the remote planet Lorigon. However, Madison and crew find themselves under the control of a powerful computer on Lorigon that incites everyone to have sex.