Pump to produce or improve human penis erection comprising a substantially tubular inner assembly (C) having a rimmed annular edge (C1) suited to accommodate an erect human penis, a translating assembly (T) sliding along said inner assembly (C) having the opposite end to said rimmed annular edge (C1) of said inner assembly (C) shaped like a dome (T1) with an opening or circular seat (T2) suited to accommodate a valve (V) made of elastic material and a lid (U), a bellows (S) comprised of a sleeve made of flexible material having the two annular edges (S1, S2) suited to be connected and joined respectively with the rimmed annular edge (C1) of the inner assembly (C) and with the end (T3) opposite to the dome- shaped end (T1) of said translating assembly (T), and where said valve (V) is comprised of a first substantially disk-shaped part (V1) the centre of which has a second substantially linear part (V2) with a circular cross- section perpendicular to the disk-shaped part (V1), and where said lid (U) is comprised of a circular element having an elongated hole or slot (U1) in a radial direction suitable to put the seat or compartment (T2) of the translating assembly (T) in communication with the environment and through which the second linear part (V2) of the valve (V) is housed and protrudes as well as one or more additional through holes (U2).Linvention concerne une pompe pour générer ou améliorer une érection de pénis humain, comprenant un ensemble interne sensiblement tubulaire (C) ayant un bord annulaire bordé (C1) approprié pour recevoir un pénis humain en érection, un ensemble de déplacement en translation (T) coulissant le long dudit ensemble interne (C), ayant lextrémité opposée audit bord annulaire bordé (C1) dudit ensemble interne (C) façonnée en forme de dôme (T1) avec une ouverture ou un siège circulaire (T2) approprié(e) pour recevoir une valve (V) faite en un matériau élastique et un couvercle (U), un soufflet (S) composé dun manchon fait en un matériau s
