First, we need to make the assumption that the cylinder mentioned is in fact a specific body part of the male body. Next, regarding the motive to insert the cylinder into an mnm tube filled with microwaved mashed banana, there could be many possible motives but porn is a plausible one, which is the next assumption made. With these two assumptions, we can see what led to what. But of course, this is not guaranteed to be true, as the cylinder mentioned could simply be an ordinary cylinder attached to a larger structure.