If you don’t lust and are earnestly seeking to conquer any temptation to lust, then you might hafve to look for a long time.
One can be placed in such situations.
As a cadet who spent a summer in Germany under the tutelege of s young lieutenant, I once went out in the big city with him as my ride and guide. We spent some time enjoying the night life. He kept insisting that he was going to “get me laid”. He was bothered by my loyalty to my longtime girlfriend (now my wife) and my chastity. He ended up going to a brothel (they are legal in Germany), knowing that I was dependent on him for a ride and to even find my way out of that section of town and back to my barracks since I did not know any German. Of course since this was a shady part of town I went inside the building, but I waited in the hallway for him and all sorts of tarted up sluts tried to encourage me to spend some of my money on the sexual favors they were selling.
This seemed to last for an hour. I will never forget the temptation and my determined victory over it through and for God.
The lieutenant never harassed me about my loyalty to my girlfriend or my chastity again.
I think Jesus was making a point here ... Women do not understand the strength of the sex drive God gave men .. We do not understand that a man may have sexual thoughts over what to us seems innocuous .
I have a very strong Christian friend who will not go to see that new “christian “ surfer because the movie has a lot of girls in skimpy swim suits.. he is a grandfather, not a kid.. yet he keeps himself from that “occasion of sin”
Most of us are not good at making a decision when a mental temptation turns into a sin .. when admiring your friends new car becomes covetous.. or when looking at a woman becomes covertness or lust..
Jesus was more pointed earlier in the chapter when he said we do not even have to think about killing our brother in order to be guilty of it.. all we need do is think he is a fool..
The dividing line between Temptation and mental sin is very thin ... much thinner than actually acting on our thoughts