My friends and I make a lot of effort to make sure that we don't financially impose on each other. Sure, every now and then, a few of us will need a loan, but only in dire circumstances. We all have our pride, and we respect each other too much to take advantage of each other. (We are, however, shameless in raiding each other's refrigerators lol.)
I think you girls need to talk to the guys. It seems they've gotten so used to it that they'll continue to mooch off you for a long, long time.
Not all those who wander are lost.