Could we have endless pleasure?
Of course. 

There is a famous set of experiments (Milner &amp; Olds) in biology that basically started modern behavioral research in which a wire was inserted in to a rats brain allowing for direct electrical stimulation of the pleasure center. as long as the current continued the rats experienced extremely high levels of pleasure. To the point they were unwilling to engage in any voluntary behavior, including seeking food and water, even when right next to them if it would interrupt the pleasure. You could keep stimulating the pleasure center until the rats died of thirst.