Where I live is kind of rural so there isnt that many billboards/ads but even then if I see one I don't think "oh no now I need to fap

"
still how is an advert getting you off are you that much of a coomer
Are you that mentally weak? Thats not a valid excuse its all mental its not like you do that depraved stuff out in the open the moment you see a woman so just control yourself when you get home and don't resort to fapping.
It shouldn't matter how a woman's dressed because you should be lowering your gaze warya and stop complaining its all about displine you shouldn't be looking at that stuff turn away and like I said before find something to occupy your attention and you'll be fine.