Beauty Dish Photography
This is a simple one light shot. White back drop, a beauty dish with an Einstein 640 flash, 1/4 power. Light was positioned to the extreme camera left approx. 45 degree angle over shoulder of man pointed at girl.

Canon 7D
lens:  70-200mm f/2.8
Aperture f8
Shutter Speed 1/250
White background turned grey since the couple was 8 feet in front.  The skin tones varied dramatically, desaturation was the ideal solution.