I guess this might be something actually easier with drawn 2d art. Its nice being able to see curves a bit more. Though its not really realistic I guess. What you have is very realistic (makes sense for cast shadows to not have clear form), kudos, but not sure if its worth being a bit less hot. Pretty subjective I guess. Its more mysterious as well, which might be good.
Most porn games use silhouettes so breasts and curves are very apparent. So while you arent actually seeing everything, its still very hot.
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I guess physics wise, you wouldnt really be getting such clear outlines. But at least for me hotness > complete accuracy.
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Have you tried just having the models and making them just pure black (or well, not 100% black, a shade of black)? No having to bother with actual shadows physics etc. I dont know, maybe the result will look like shit with 3d renders. But At least thats kinda how the 2d ones work. Its just regular art, but shaded.
Its kinda interesting, but thinking about it, I am not sure if I have seen silhouettes like that used in a 3d render game. You might be the first?