Usually I find stubbornness a turn-off, but...

... when my Taurus lady becomes all stubborn I find it really sexy. Why is that?

maybe cuz her stubborness equals strength in ur eyes? she's a strong woman who can hold her ground.

I think you're right. It makes her a more challenging person to deal with, but somehow that makes her more irresistible to me. I really do admire her strength of character too - I love that in a woman!