Angelina So its not so much that they are directly coupled but rather both habits have a similar effect/cycle. When I drink, particularly if its a lot, its fun at the time but then I am tired or even hungover later. If I masturbate it too is fun at the time but then I feel much more tired and/or down later. The downward part of the cycle makes you want to do something to climb back up.
So if I drank recently, I might be inclined to masturbate and vice versa. In addition, drinking weakens my will to resist things I normally don't want to do while I am drinking. The down cycle of one promotes the up cycle of the other and creates a vicious cycle for me. So far I am having much greater success breaking both at the same time.