Hey guys! I don't know if it's good to write such question into this thread or not, but because there are some artists in it I guess it's ok to ask such thing here: I ran almost into the situation like in the first post, but "from the other side".
I planned to make some gameover CGs for free remake that I'm doing, but I ran into the problem of the lack of resources for hentai drawing learning (my partner who re-drawn animations for the remake 2 years ago is busy now with other project and it seems that he doesn't want to continue re-drawing for this one, hell knows why, it's all about inspiration after all, maybe because no money involved). I assembled the collection of reference artworks with common type of the girl involved (well, blondie with big tits and straight hair is quite common type in any hentai/porn, I guess) from different hentai movies/mangas/etc. in order to understand how proportions/skeleton/poses works for such art style. The problem is that I lurked for different tutorials about hentai drawing (well, I'm not happy that I'll have to learn how to draw it by myself, because I'm coder, but with proper educational material and A LOT of practice I hope it's possible) and I didn't find anything suitable. There was an old book about 90s hentai style drawing, but damn that's too old, I don't like art style from that date.
Can anybody of the artists here advise me what to do in such situation (I'm looking for some books/tutorials/software/tips/etc., you can do it here or PMing me directly)? IMHO coloring/shading and proportions are much different in hentai from classical nude drawing, so that makes the search difficult. I don't want to be involved in tracing because it seems easy from the first look, but it causes lots of the problems, they were described in this thread by some artists already, but I'll summarize them again:
1) Copyright infringement or reputation butthurt. There are lots of examples of poses/moves in porn/hentai/movies which are almost must-have or common in any artwork (remember the example of pose books?) as well as general proportions of character sizes and even this causes lots of drama (I've read an article about tracing on EncyclopediaDramatica, this problem goes much beyond hentai games), but direct tracing is, well, enlargement of the problem itself and creating drama from scratch with spending your time on overpainting that will bring the pain in the ass;
2) Even if we're looking at this problem from technical side without legal/emotional side then tracing seems to be an easy way to get what you want from the start relatively fast, but raises huge problems in the future for the project: you are stuck. If there is a need to change or upgrade anything in it then you will not be able to do it - changing pose, draw new character with similar art style, make an art for the sequel, even bending fucking hand/leg/dick is a problem because you're stuck with initial photo/artwork (I don't even mention coloring/shading problems which will appear anyway).
@All:
If this post is too long for you to read then explanation of my question is simple: I want to find out how to draw proper hentai pictures using references without direct stealing/etc. and learning from them in order to gain own art style for creating new artworks from scratch, I guess there is a difference between stealing and learning, right?
@Moderators: If my question seems to be not related to this thread then pls move it into separate thread or into specific existing one, I guess this problem is common for anyone who wants to draw HCG for his game without running into problems and being a good guy at the same time.
P.S. I didn't play that Pussy Saga mentioned in the first post, but judging from the review on LewdGamer somebody wanted to shorten their deadlines really fast for gaining cash and he is now a little bit fucked, lol.
First of all, let me recommend you this book: "Drawing on the Right Side of the Brain",
you can see effects in a matter of days 
It's a shame I didn't know about this earlier (probably case of my stubborn "I will learn all by myself").
As for tracing... Well, traced stock images aside (that's a thing I mentioned in earlier post), it's good if you are using this to learn. More like, trace image and try to reverse-engineer it, build skeleton, see how body parts are connected, why those are connected in such way and so on.
Same goes for references, as long as it's not direct copying.
Best example would be: You see a manly man in manly pose. You use it as a reference, but you aren't drawing a guy, it's a girl or cat or whatever. So few things will be different, first your own style will kick in and modify this and that. Then whole skeleton could be different and so on. Pose will be similar or even the same, but it's not the same image.
Look at this pose:
I am sure you have seen similar or exact one in many places. Why? Because this is a reference. You can even ask a girl to do this pose and use it as reference, in the end you will have this or similar pose, end of story.
Angle, perspective, body shape and own style on top of it.
This is not tracing, it's referencing (I am just repeating myself now, am I?).
As for the style... Well, you can try to imitate style of anyone and as long as it's just imitation and not directly traced images, it will be fine. Why? Because as long as you are drawing and practicing, it will morph into something different, into your own style.
Maybe it will look completely different, maybe not as much.
But, as long as it's something that you did yourself, it's ok.
It's all summed up like this: put 2 images side by side or one on top of another and see if those look the same, if yes... well, it may be a case of plagiarism.
And let's not forget about people that are pretty much living copying machines, that can bring image from their memory and draw it, sometimes not even being aware that they are drawing exactly same thing they saw somewhere.