i think its unintentional. just as it is for women... also it has to do with how people think..
i.e.: I don't want to be nagging, or seem like I'm needy. I want him/her to text me that way I know theyre interested. blah blah blah ect. ect.
its just the way things are, if you're lucky you'll find a guy who is straight forward with you. girls confuse guys just as guys confuse girls. its an argument males and females get into often about you guys are confunsing and you girls make no sense. there's really no reasoning to why we do the things we do.. we just do them.