My ex-girlfriend and I once went to a street festival and the policeman had a horse with a cock which dangled down two feet! It was kind of funny and weird, but I did notice she did seem faintly aroused and unduly interested by the sight.
Later on in bed, I was on all fours beside her and she stroked by cock until it got longer and longer and stretched down nearly to the sheets. She muttered and laughed a few times about it being like the horse. So it turns out she was turned on by the earlier sight of the horse's cock.
It was a turn on for me to be compared to such a giant animal, and after that she liked to have me in that position and stroke my cock until it dangled down to great proportion.
Here's a good picture in that, all fours position
Later on in bed, I was on all fours beside her and she stroked by cock until it got longer and longer and stretched down nearly to the sheets. She muttered and laughed a few times about it being like the horse. So it turns out she was turned on by the earlier sight of the horse's cock.
It was a turn on for me to be compared to such a giant animal, and after that she liked to have me in that position and stroke my cock until it dangled down to great proportion.
Here's a good picture in that, all fours position