Men who claim not to be attracted to 13-17 year old girls are full of ****
You may not want to sleep with them for moral reasons (because you don't think they're capable of consenting to sex), but if you claim not to be attracted to them you're:

a) gay
b) lying
c) brainwashed by feminist culture

If you want to get technical, the human brain isn't fully developed until around age 25, so at 18 a girl is further along in adolescence than a 13/14 year old girl, but not yet finished. The age of 18 as the age of consent is pretty much arbitrary. Both 13 and 25 make more sense (you could argue for either one).