But maybe not that much -
http://www.popsci.com/science/articl...ers-study-says
Of course, the study used a limited sample of pretty specific women.  And, not to worry, it's unlikely to have any real-world applications.  Attraction takes into account myriad characteristics, and is unlikely to  be well mirrored in a study with weird, white CGI male figures. 
 To conduct the study, the biologists created 343 male figures with  all possible combinations of height, shoulder-to-hip ratio and penis  size within a natural range. (I must note that the figures are kind of  creepy-looking, although I understand they were created to keep other  traits, such as skin color and facial attractiveness, constant.) The  biologists then asked women who volunteered for their study to view a  random sampling of 53 of the figures and to rate the figures'  attractiveness. Statistical analyses of the women's answers yielded such  gems as: 
 
- Shoulder-to-hip ratio mattered the most, while both penis size and  height mattered about the same amount, and less than shoulder-to-hip  ratio.
 
- Penis size had a greater effect on attractiveness rating in taller men than in shorter men.
 
- Penis size also had a greater effect on attractiveness rating in men  with higher shoulder-to-hip ratios than in men with smaller shoulders  compared to their hips.
 
- There were diminishing returns for everything. That is, how much  more attractiveness the figures gained for added height, penis size and  shoulder-to-hip ratio decreased as those traits increased. So the  attractiveness difference between at 6'1" man and a 6'2" man is less  than the difference between a 5'1" man and a 5'2" man. For penis size,  the dropoff in attractiveness gains started at about 7.6 centimeters, or  three inches (remember, that's flaccid length).
 
- Women's ages did not affect their attractiveness ratings, but  women's heights did. Taller women made height more important in their  ratings than shorter women did.
 
- Women took longer to rate figures they found more attractive.  Previous studies have found that people generally spend longer gazing at  things they find attractive.