Well i really dont have that problem, neither knowing someone with that problem, but what i think is that some guys are intimidated but not for bad reasons, they are intimidated about being rejected or saying something bad and ruining all the progress, if is like that then im a little intimidated too, i always wait to be a little more friends with hot girls because i dont want to lose her
but well everyone has their fears maybe they are just really scared about them :$ who really knows??
Well thats all i think take caree :3