Well because the human body was designed to be symmetrical, If this were to happen the child would live until the body compensates, with an uneven gait. This uneven gait can affect the curvature of the spine if it goes on long enough causing exaggerated curvatures, called Scoliosis.
Here is an interesting fact though, a fracture through the epiphyseal plate of developing children when broken can actually stop growth of the bone causing almost the exact same thing.
The answer is no you can not feel spasm twinges when sperm fertilize the eggs
You just carried out flex ion of the legs
The joint is the ball and socket hip joint
I believe Toxocariasis is the answer you need
Continued use/ or addiction
They have been using it for a while and might start to get addicted if not already
