How to Talk to Girls at Parties - Neil Gaiman

Honestly, I don't know what to make of this short story. 
Basically, these two guys go to a party and the one goes upstairs with a girl while the other tries picking one up. After talking to a couple of girls, and striking out for various reasons, his friend reappears in a hurry and they both literally run off.
I'm left sitting here wondering if the house of girls, where the party was, are aliens. 
Yup. That is all.