OK - let's see....
There is a "certain" way to get things done that works & is reliable....soooooo - it would make sense to use that method at times....
However, each time we have sex - I for one, don't have to cum each time....I do derive a certain amount of pleasure by pleasing HIM and making him cum.....plus he may not cum each time and I will - so it works both ways....
BUT - there IS something to be said in discovering new "spots" of pleasure and figuring out new ways to get each other off....