This is what I understand about these thoughts in general: they are not sinful
per se, nor is the instinctive response of your body and mind to them (obviously they are enticing, otherwise they would not constitute a temptation at all, would they?). The issue is your choice. Do you reject them or indulge in them? Being tempted to indulge is not the same as indulging. To reject them is to be subject to such thoughts but to have an inner disgust for them as a distortion of something sacred.
Usually, also, we can always tell if we give deliberate consent to a sin - that is, we can p(name removed by moderator)oint the moment when we made the choice between rejecting or accepting to commit a sin, the moment in which our full self said: this can be bad, and we answered: either, yes, away with this, or: I don’t care, I want to enjoy this. Check this out:
then I thought, “No, you need to stop now.” And I did stop.
There you have it. The critical moment. It seems to me that no sin, neither mortal nor venial, was committed.
So I would not worry. However, I usually do confess (and follow the advice of those who recommend confessing) venial sins. We should confess every one or two weeks even if we are not conscious of mortal sin.
Also it is a great blessing to be able to discern this inner voice that warns us of the impelling danger, regardless of whether it come from our mind, from our guardian angel, from the Holy Spirit…do not discard this as being scrupulous, because scrupulosity is a different matter…scruples - in my understanding - is when something is
not grave matter and yet we think it is. Lustful thoughts - though as simple as the ones you describe - ultimately are, I think.
Remember that humans are made to love and be loved

The issue is that our adversary and father of all deception brings disorder into what is otherwise holy. By choosing God above all other goods, we seek the Kingdom first
