The odd phenomenon of cycle of emotions

it is a well-observed fact that that the cycle of emotions never cease to exist, but they do follow a defined route which I shall refer to in this question as the SFE route namely: A sensation-----feeling-------emotions(----represents"gives rise to")say, when I eat a doughnut, the sensation is of eating, feeling of pleasure, and emotion of happiness. how can I use a similar mindset of this technique to counter lust like emotions which arise and disturb through my meditation practice and sometimes cause me to relapse on my bad track of sexual misconduct. for eg: when a lustful thought emerges in my mind is suppress it easily by satipathana and mindfulness however when a thought arises related to the act of copulation, it becomes impossible to suppress it as it is very difficult to view the act objectively.(i.e without any biased feelings and from a neutral point of view).this thought then keeps appearing until I finally give into my bad ways of self-pleasuring as I am a novice-in-training and not being accepted due to this reason. P.S: please forgive me if this answer seems to violate or copy other answers, i am new to the various technicalities of this website and will take time to adjsut.