To get rid of gamey smells and testes, cooking temperature is the key as my experience. Btw, many people in Asia put lots price for that gamey flavor you know. The simple way I would recommend is you cut the meat in slice about 5mm thick, and mix them with cooking oil, salt, pepper for a while, keep cold. Using cast-iron pot fry it, just like cook a mini steak. Sika deer is the most delicious deer do `t wasted. Or, if you live in rural area, then you could dig a hole, fire it up and when temperature goes down, no flames, hang a chunk of meat in and cover it with something, slow bbq for about two hours.
cheers
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