A penis erection stimulation system comprises one or more infusion needles, the tip ends of which are disposed within and implanted along with at least one first housing adjacent the patients left and right corpora cavernosa. The respective other end or ends of the infusion needles are disposed and implanted along with at least one second housing remote from the first housing. A reservoir and a pump are also implanted inside the patients body to supply the infusion needle with infusion liquid. A drive unit also adapted for implantation inside the patients body is arranged for advancing and retracting the infusion needle such that its tip end penetrates the at least one first housings outer wall at least in two different penetration areas either simultaneously or in immediate time succession, thereby injecting drugs into the patients body for stimulating penis erection.
