IMO: Neither. Yet.
Temptation is not sin. What you do after the "half a second or so" of temptation is what counts. If you consciously avert your eyes, and concentrate on the Mass, or the message of the stained glass, icons, statues, whatever, you have not committed sin.
Alicia the Hottie should not put you in the position of having to face this issue, though. She can't help being a knockout, but knockout or not, she should be dressing modestly. So should you.
Now, before the inevitable idiots compare me to the Taliban, there's a huge "space" of dressing modestly in between the extremes of "scraps of cloth that leave nothing to the imagination" on the one hand, and a burqa on the other.
"Temptation is not sin. What you do after the "half a second or so" of temptation is what counts. If you consciously avert your eyes, and concentrate on the Mass, or the message of the stained glass, icons, statues, whatever, you have not committed sin."
Oh, good. It's annoying to be buffeted with those temptations all the time, though.
"she should be dressing modestly. So should you."
If I were to dress immodestly, that might be the occasion of sin for someone, but I guarantee that sin would not be lust. Is hurling in church a sin?