The problem with guys looking at photos is that most guys are not Mature enough and as soon as they see ANY photo they are likely to think something along the lines:
i think i’ve seen prettier girls around so i should wait for more offers because i might be able to get something better.
Guys think of all the girls who you went out with for more than 1 date and honestly answer yourself: would you give ALL those girls a chance if you only saw their photos?