Chivalry isn't how sexual attraction works anymore.
If an unattractive chick started doing favors and opening doors for you, would you be anymore attracted to her because of it?
Of course not. Same for women, too.
In the ye-olde times when chivalry was popular, women looked for men who give and do more stuff for them. The more stuff the men could give women, the more rich they were, and the higher on the social latter they were.
The norm has changed since then and women don't need to do that anymore to gain opportunities.
EDIT: However, that's no reason to not have common manners and politeness.
If an unattractive chick started doing favors and opening doors for you, would you be anymore attracted to her because of it?
Of course not. Same for women, too.
In the ye-olde times when chivalry was popular, women looked for men who give and do more stuff for them. The more stuff the men could give women, the more rich they were, and the higher on the social latter they were.
The norm has changed since then and women don't need to do that anymore to gain opportunities.
EDIT: However, that's no reason to not have common manners and politeness.