Something else to consider is to simply be careful about the time of day in which you shoot. If I client asks for a session anytime between 11 am - 4 pm (depending on the time of year) I let them know that the light is not flattering during those times. And even 11 am is pushing it. I like to start by 9 am at the latest and
finish (in the shade) around 11.
Clients are not sensitive to the sun and how it behaves so we have to teach them. People just see a bright blue sky and think, "What a gorgeous day." Well, not for us.

In addition to using the sun as a backlight (as Kadie mentioned) you can also make a virtue of it and
feature the sun in your shot. I love to shoot kids while they're running toward the camera (with me running away from them holding the camera along the grass) and very often I will shoot into the sun to get a great flare.