People rehearsing and practicing what they are going to play in a music store? You guys are nuts. Unless you're looking for a new band, in which case its kinda an open audition.
What makes you think women are still impressed with you playing some guitar from decades old songs? Unless you're the hot bad boy playing a sensitive song around a campfire you'll probably have more success saying you're a DJ.
We’ve all got our own ways of approaching things. For me I need to think ahead of time about what it is I want to explore when trying a guitar. I’m not trying impress anyone; I’m just trying to figure out what will indicate whether a guitar will work for me. I admit I tend to get nervous in music stores with all these other people around who I know are also players. I don’t get nervous playing live at a gig, but for some reason music stores get me more tense so I work out what to play so I can focus better.