Plow King is in the right direction ... if the texts call it an effect of roll, they're wrong - adverse yaw is an effect of aileron - and during most of a turn, ailerons are only slightly deflected, so only slight effect.
Plenty of aircraft display adverse yaw - especially older or special purpose aircraft. Pop down to your nearest gliding club and arrange a bit of a joy flight - then see adverse yaw. The (few) gliders that I've flown have displayed quite spectacular adverse yaw - you must lead a turn with rudder, or you get all sideslip and no turn!
I count gliders as special purpose - your average GA aircraft is designed to be easy to fly, and a bit of extra drag from Frize ailerons is acceptable. A glider is designed to fly well, no extra drag thanks, so you just have to learn to fly it well.