There's nothing quite like seeing a guy walk into a street sign or sidewalk signboard because, instead of watching where he is going, all of his attention is fixed on an attractive female in his field of vision.
This isn't a seasonal issue for easily distracted men. It can happen at any time of year. But it might be safe to say that summer certainly sees its share of walking while ogling.
Where this ceases to be amusing (I'm assuming the women in question are unaware of the staring and thus not creeped out) is when the guy is driving a car.
I once saw some genius almost drive off the road while clearly checking out a female pedestrian. Someone could have gotten hurt.
Perhaps women walk into things, too, when their minds are not on putting one foot in front of the other. But I haven't seen one lose control of a vehicle because of how some Cary Grant looked in his tank top.