According to recent research women find musicians more attractive than non-musicians. And much more attractive than sporting types.
The research was based on sending a 20-year-old out in the streets to approach young women and ask for their phone numbers. He had the most success when carrying a guitar case - see, you don't even have to know how to play it - and least with a sports bag.
But this was French research. I imagine a sultry French guitarist with a Gauloise hanging from his lip would look fairly attractive. And I hate cigarette smoke.
It didn't work the other way around though i.e. men weren't more attracted to women carrying musical instruments than those without. No great surprise there: men have much simpler needs.