Feather or rain?

A Marine is sitting in a bar drinking and wondering why he hasn't had any luck with the ladies that night. He's young, fit, and in his dress uniform, but none of the ladies present want anything to do with him. He wonders if he should leave but watches a Soldier in his dress uniform enter the bar, walk over to a girl, whisper something in her ear, and they leave together. 30 minutes later, the Soldier is back, finds another girl, whispers something in her ear, and they leave together. The Marine is mystified as the Soldier returns another 30 minutes later and starts to walk past him. "Excuse me, but how are you doing that? I've been striking out with the ladies all night."
The Soldier replies, "It's easy, you just say something to them that you can turn around if they don't take the offer."
Marine, "What do you mean?"
Soldier, "Well, I tell them 'Can I tickle your ass with a feather?'. If they say yes, then it's game on. If they say what or excuse me, then I tell them I said 'Oh, this is some pretty shitty weather'."
The Marine smiles and says "That's easy! Let me try!"
The Marine walks over to a gorgeous redhead at the other end of the bar and says "Stick a feather in your ass?"
The redhead snaps her head around and glares at him, "Excuse me?"
The Marine shakes his head "Fucking rain."