[EDIT] Added formatting.

I'm on my way home right now from climbing. A girl asked me to take her climbing at the gym, so I agreed. I've taken several girls climbing over the years... Never a big deal. Tonight before I left wife asked who I was climbing with. "Mike and the girl from the Trunk Club."
W: does she know you're climbing with Mike?
Me: No
W: so you're leading the poor girl on. She probably thinks you're going on a date.
Me: I doubt it.
W: tried to continue the argument that girl would feel led on.
Me: you're probably right. And she's probably expecting some really awesome sex afterward!

I'm going to walk through the door and hear immediate questions: "so how was climbing with trunk club girl?"

What's a good response?
One idea - It was ok, but she showed up naked, so that was a little awkward. But after she stretched and warned up it was all good.