In my experience, women are interested in hearing about the guy's passions, not less so if that passion is building a transformative startup.
I don't think it's fair to make that assumption. Passions are awesome, but they'll lose interest if you start describing the intricate details. That's not only true about women, but most people in general. The trick is in how you describe, and not what you're describing.
One remarkable girl had me asking questions for half an hour about shoes, for example. I hate shoes.