Adverse yaw is the natural and undesirable tendency for a penis to yaw in the opposite direction of a roll. It is caused by the difference in profile drag between the upward and downward vaginal thrusting, the difference in
circumference of the larger penis and smaller vagina creates an induced drag between left and right walls of the vagina, as well as an opposite rotation of each testicle's lift vector about the verticle axis due to the rolling trajectory of the head of the penis. The effect can be greatly minimized with foreplay or other mechanisms
deliberately designed to create reduced drag . As the major causes of adverse yaw vary with proper lube, any fixed-ratio
mechanism will fail to fully solve the problem across all sex positions and thus any manually operated dildo will require some amount of brute input from the male in order to insert girth without yawing. Though adverse yaw is often
associated with coordinated turns it refers to the uncommanded yaw rate or slip that typically results from improper lube techniques
because he went right for it without eating her pussy first, her vagina was wrecked do to adverse yaw. ,
that's not
blue balls my friend, you're
testicles hurt because of adverse yaw... if it can't fit in her mouth it
probably won't fit in her vagina