An adult sex toy containing a self-lubricating system, the adult sex toy being substantially being phallus-shaped and comprising: a pipe network; an aperture formed in the adult toy, the aperture connected to the pipe network to provide an outlet therefor; and a peristaltic pump, the adult sex toy characterized in that: the peristaltic pump engaging externally against the pipe network, the peristaltic pump thereby configured, in operation, positively to engage a section of the pipe network to urge fluid or gel to travel through the pipe network in the direction of the outlet; and the wherein the adult sex toy further comprises: a hollow core arranged to receive a collapsible lubricant cartridge having an inner volume filled, initially, with a dispensable fluid or gel; and a tubular member located in the hollow core, the tubular member engaging into the collapsible lubricant cartridge to provide a fluid conduit to the pipe network thereby to allow the dispensable fluid or gel to be controllably dispensed from the aperture under controlled operation of the peristaltic pump and wherein the fluid conduit provides the only air-entry or fluid egress path to the inner volume of the collapsible lubricant cartridge when the collapsible lubricant cartridge is loaded into the hollow core of the adult sex toy. a pipe network; an aperture formed in the adult toy, the aperture connected to the pipe network to provide an outlet therefor; and a peristaltic pump, the adult sex toy characterized in that: the peristaltic pump engaging externally against the pipe network, the peristaltic pump thereby configured, in operation, positively to engage a section of the pipe network to urge fluid or gel to travel through the pipe network in the direction of the outlet; and the wherein the adult sex toy further comprises: a hollow core arranged to receive a collapsible lubricant cartridge having an inner volume filled, initially, with a dispensable fluid or gel; and a tubular member located in the hollow core, the tubular member engaging into the collapsible lubricant cartridge to provide a fluid conduit to the pipe network thereby to allow the dispensable fluid or gel to be controllably dispensed from the aperture under controlled operation of the peristaltic pump and wherein the fluid conduit provides the only air-entry or fluid egress path to the inner volume of the collapsible lubricant cartridge when the collapsible lubricant cartridge is loaded into the hollow core of the adult sex toy. the peristaltic pump engaging externally against the pipe network, the peristaltic pump thereby configured, in operation, positively to engage a section of the pipe network to urge fluid or gel to travel through the pipe network in the direction of the outlet; and the wherein the adult sex toy further comprises: a hollow core arranged to receive a collapsible lubricant cartridge having an inner volume filled, initially, with a dispensable fluid or gel; and a tubular member located in the hollow core, the tubular member engaging into the collapsible lubricant cartridge to provide a fluid conduit to the pipe network thereby to allow the dispensable fluid or gel to be controllably dispensed from the aperture under controlled operation of the peristaltic pump and wherein the fluid conduit provides the only air-entry or fluid egress path to the inner volume of the collapsible lubricant cartridge when the collapsible lubricant cartridge is loaded into the hollow core of the adult sex toy. a hollow core arranged to receive a collapsible lubricant cartridge having an inner volume filled, initially, with a dispensable fluid or gel; and a tubular member located in the hollow core, the tubular member engaging into the collapsible lubricant cartridge to provide a fluid conduit to the pipe network thereby to allow the dispensable fluid or gel to be controllably dispensed from the aperture under controlled operation of the peristaltic pump and wherein the fluid conduit provides the only air-entry or fluid egress path to the inner volume of the collapsible lubricant cartridge when the collapsible lubricant cartridge is loaded into the hollow core of the adult sex toy.