I don't understand why I had such a dream. There's no way in heaven I would so easily acquiesce to such a dream. Is this the devil attacking me? I haven't had dreams like this before, at all. I need some advice, because that really disturbed me..

Dreams are not under the control of the will and therefore not sins.  A dream can be a window into our fallen nature.  While this is disturbing, it can also be a good thing.  You have seen where you will end up if you rely on your own strength.  Let this dream encourage you to cling to God.  Let it inspire you to pray more and to turn to the Sacraments, especially Confession.  Remember Confession does not just bring you forgiveness but also strength to fight against sin.

The devil hates it when someone is determined of breaking loose from his snares. You seem to have understood how powerful the Rosary is; it is a most blessed weapon.

If you want you can also consecrate yourself to the Blessed Virgin Mary (in the manner of St. Louis de Montfort, for example) and to Saint Joseph, the Terror of demons.

Non est nox in ea.
In Her there is no night.

You can overcome pornography, but let me tell you, it's like kicking alcohol for alcoholics... You always will be fighting.  It just gets much easier.  Alas, those images will recur and attack you from time to time.  There is a price to pay for looking at such things, that man was not meant to gaze upon.

I have had those dreams.  In the dream, there is a feeling of "giving in" and it's like you're conscious of committing mortal sin.  This happens to me once every couple months, I will have extremely vivid, sɛҳuąƖ dreams and while all of this is going on there is a sense of dread and falling into hell that feels very real.  

Then you wake up and realize it was all a dream.  That's the part I like.  

 

Hobbledehoy's signature:

"Thou wilt terrify me by dreams, and by visions shake me with horror" (Job ch. vii., 14).

This is taken from the very enthralling seventh chapter of Job, wherein he unnervingly shews the realities of human life. One should read it when tempted to such things as avarice, gluttony, impurity, attending a questionable event, etc.

It is interesting that the lessons at Matins for the Office of the Dead are taken from Job (the Cistercians take their 9th lesson from the Second Book of Machabees, ch. xii.).

Back to the subject: you need not worry about dreams, because you are not culpable for what happens therein, no matter how vivid it may have felt, by reason of the fact that a slumbering person cannot make use of his reason and thus act as a moral agent. The dreams can become occasions for sin if you fixate upon them afterwards, or they can be the consequences of sin (for example, consciously and willingly seeing an indecent movie that would provoke such a dream). The best thing to do if these sorts of dreams happen unexpectedly and without the consent of a previous occasion of sin (e.g., an indecent film) is to try to forget: distract yourself with the fulfillment of your duties or with hobbies (algebra!), and (above all) having recourse to prayer (especially to the Blessed Virgin). Humbly offer this very humiliating and painful trial as a sacrifice of adoration to God through the hands of the Blessed Virgin, and you shall receive graces that exceed your petitions.

These dreams are signs of your progress insofar as your soul is being purified by strong temptations that by overcoming them, you may be more in control of your passions and overcome greater temptations that will certainly await you as you move through life. God usually does not test souls that are new to the interior life with strong temptations, and the devil does not usually bother attacking those souls who are already his by their choice of clinging to sordid habits (they do the work for him).

When I was young, I used to think these dreams and temptations were signs of failure, and I gave in to an evil melancholy that nearly drove me to despair. However, I eventually came to see that these temptations are not signs of failure or that God has abandoned the soul: they are actually signs that God is listening to your earnest prayers and has vouchsafed you precious opportunities to expiate for past misdeed and to purify and strengthen your soul from future assaults of the devil, the world and the flesh.

Hope this helps.

As others have said, we have no control over what we dream and therefore are not sinning by having a bad, suggestive dream (unless we hope to have such dreams, that would be sinful). I sometimes dream of such immodest junk even though I have no desire to. When I wake up from it, I always feel like telling God I'm sorry even though I know I can't help it. I cannot stand having such dreams. And what's worse is that in the dream, it's as if everything is normal and a-ok, and that you have no problem giving in to the immodesty. I never liked dreaming anyway, regardless of whether or not it was a bad dream. I've never really had any good dreams, they're all wierd. I just want to wake up from them, it's a very wierd experience.

Anyway, you can always pray that God will protect you from such immodest dreams. I know that St. Raphael the Archangel is good to pray to for fending off bad dreams. You should pray to him every night.

There is so much helpful info here. Thank you all very much.

Hobble, I see you also really like St. Raphael. Is he your Patron Saint?

Well, he is a Saint I deeply admire, and whose name I wish I would have been given at Baptism. The Book of Tobias is one of the most beautiful books of the Old Testament.

I recommend devotion to St. Raphael to young people who have problems with purity or who are seeking someone to court, betroth and wed in Holy Matrimony. His intercession and tutelage is very efficacious on behalf of those who are assailed by illnesses or by demonic attacks, and he is also the heavenly Guardian of travelers.

He is one of those wonderful thaumaturges like St. Anthony of Padua or St. Philumena, whose intercession has been beneficent for all sorts of the faithful.

St. Joseph is in an entirely differently order: being the Spouse and guardian of the Virgin Mother of God and the foster-father of the Incarnate Word, he was predestined to grace and glory far superior to all the other Saints and Angels, since his mission was inherently involved in the hypostatic order which is constituted by the Incarnation and is superior to the order of grace that constituted the mission of the Precursor, St. John the Baptist, and the mission of the Apostles, for example.