Despite its unbeatable efficiency, Viball cannot fulfill the expectation of being a mechanically based "permanent pleasure provider" with the intensity of a battery-operated vibrator. With smaller Viball models, the effect is more gently stimulating than directly arousing, but it is much more durable and can be used in everyday life than a battery-operated toy or prostate vibrator could. With the smaller sizes, Viball usually stimulates below the threshold of perception, but the corresponding parts demonstrably react to the impulses with increased blood flow and unconscious muscle activity. The larger the models and the more intense the movements, the more directly perceptible the impulses become and the more erotically intense the stimulation. Very long stimulations with large models with strong movements can trigger orgasms and in men lead to an emptying of the seminal vesicle without an orgasm.