The Erection Hardness Score and Its Relationship to Successful Sexual Intercourse

The close and direct relationship between erection hardness and SSI supports the broader use of the EHS-a simple, valid, reliable, and responsive measure-in clinical practice. Goldstein I, Mulhall JP, Bushmakin AG, Cappelleri JC, Hvidsten K, and Symonds T. The erection hardness score and its relationship to successful sexual intercourse. J Sex Med 2008;5:2374-2380.