A method of making a flexible polyurethane foam, comprising reacting, at an isocyanate index of 60 to 110, a reaction mixture comprising A) a polyether polyol having a hydroxyl equivalent weight of no greater than 225 or mixture of two or more such polyether polyols, wherein the polyol or mixture of polyols (i) has a number average hydroxyl functionality of 2 to 4; (ii) includes at least one polyether polyol that has a hydroxyl number of less than 170 and (iii) has an oxyethylene content of at least 10% by weight and/or includes at least one polyether polyol that contains at least 40% by weight oxyethylene units; B) 1 to 5 parts by weight water per 100 parts by weight of component A), with C) at least one organic polyisocyanate, in the presence of D) at least one catalyst for the reaction of an isocyanate group with water and/or an alcohol; E) at least one foam stabilizing surfactant, F) 1 to 45 parts by weight of a tackifier per 100 parts by weight of component A) wherein (i) the tackifier has a viscosity of at least 5 Pas (5,000 centipoise) at 25°C, and (ii) the tackifier has a glass transition temperature of at most 20°C, and G) 0.05 to 10 parts by weight per 100 parts by weight of component A) of at least one monoalcohol, the monoalcohol being characterized in having at least 4 carbon atoms, a molecular weight of up to 300 g/mol and a viscosity of up to 500 cps at 25°C as measured using a cone-and-plate viscometer, provided further that the weight proportion of components F) and G) is at least 20:80 but not greater than 95:5; wherein components F) and G) are pre-blended prior to being combined with either of components A) and C) to form a pre-blend having a viscosity of no greater than 20,000 cps at 25°C as measured using a cone-and-plate viscometer. A) a polyether polyol having a hydroxyl equivalent weight of no greater than 225 or mixture of two or more such polyether polyols, wherein the polyol or mixture of polyols (i) has a number average hydroxyl functionality of 2 to 4; (ii) includes at least one polyether polyol that has a hydroxyl number of less than 170 and (iii) has an oxyethylene content of at least 10% by weight and/or includes at least one polyether polyol that contains at least 40% by weight oxyethylene units; B) 1 to 5 parts by weight water per 100 parts by weight of component A), with C) at least one organic polyisocyanate, in the presence of D) at least one catalyst for the reaction of an isocyanate group with water and/or an alcohol; E) at least one foam stabilizing surfactant, F) 1 to 45 parts by weight of a tackifier per 100 parts by weight of component A) wherein (i) the tackifier has a viscosity of at least 5 Pas (5,000 centipoise) at 25°C, and (ii) the tackifier has a glass transition temperature of at most 20°C, and (i) the tackifier has a viscosity of at least 5 Pas (5,000 centipoise) at 25°C, and (ii) the tackifier has a glass transition temperature of at most 20°C, and G) 0.05 to 10 parts by weight per 100 parts by weight of component A) of at least one monoalcohol, the monoalcohol being characterized in having at least 4 carbon atoms, a molecular weight of up to 300 g/mol and a viscosity of up to 500 cps at 25°C as measured using a cone-and-plate viscometer, provided further that the weight proportion of components F) and G) is at least 20:80 but not greater than 95:5;