Numerous explicit pictures of Mazda3 curves:
Now, as I stated before, curves are not a bad thing. However, there is no possible way you can argue that the Mazda3 is not 'curvy'. The 2005 Volvo S40 may have a few curves (very very few), but these two cars are not even comparable - the Mazda is literally full of curves.
Again, curves are not a bad thing... even 'girly' curves are not a bad thing. Look at the Lambourghini Murcielago. I would say it holds a record for having the most feminine looking (or 'girly') curves on an automible, and holds the record for being the most beautiful car ever designed.
The Mazda is still good looking and well designed, the Volvo is still good looking and well designed. My statement still stands:
Mazda3 - curvy and girly (not that that's a bad thing)
Mazda RX8 - slightly curvy, definetly not girly
Volvo S40 - definetly not curvy, definetly not girly
Edit: Sorry about the h-scroll on this post... seems I busted it pretty good.