A standard distinction in the progression of the spiritual life is between
interior and
exterior means of perfection. Adolphe Tanquerey, in The Spiritual Life, makes this distinction (e.g. §408 ff.). The exterior means include spiritual direction. How exactly an occasion of sin should be handled would benefit from and perhaps require spiritual direction–but this is extremely hard to come by. We can also learn things by reading and comparing notes, of course.
Whether a remedy is to be found by facing or by avoiding the occasion must depend partly on the occasion at issue. I think most any competent spiritual writer would argue that sins of the flesh ought not to be daringly faced down, as we are especially weak in this area: but instead one ought to flee the occasions. So, for example, we keep “custody of the eyes”. As I am a man, I have not for more than a very brief accidental moment observed the quasi-pornographic volleyball exhibitionism in Athens, as I have no business gazing upon such extensive feminine detail. And I do my best to avert my glance when someone in public is dressed inappropriately–which is a very common experience. I rarely watch television, as the language and images are generally keyed to flattering my concupiscent side. And when I do watch, it is with chagrin that such evil could be so widespread, and with sorrow for those who watch with darkened hearts and a dulled sense of the higher things.
However, there is a concept known as “mortification of the senses”, which in some sense implies facing down the sin. For example, if I hate work, I can force myself to work, and thus in effect face down the occasion of sin.
These are both examples of “stripping
ourselves of the old man with his deeds and putting on the new”. The difference may be that we don’t have to be able to withstand blatant sin, but we do have to work. Priests who hear confessions have extra graces from their education and ordination to withstand the evils of what they hear, but laypeople don’t have to hear filth; having to work unhappily is a consequence of the sin of Adam, from which we now “toil”.
Note that laypeople should be strong enough to withstand a brief exposure to filth; the idea is not that we are pale wallflowers who wilt at the slightest error. But with blatant sexual sin, the best thing to do is to flee. Otherwise, one should adapt as per the needs of one’s perfection in Christ, accepting mortification as necessary.