Chen Ziqiang is Chen Xiaowang's nephew. Same family, same flavor, same power.
You can attend any Chen Xiaowang seminars in the US. Chen Ziqiang is also offering seminars in the US. The next are in 2012 ( have a look @ www.truetaichi.com)
As far as I know there is no book by Dr Lin. He has a website and sells a cd with files describing his technique.
I'm not a huge fan of pure mechanics when it comes to lovemaking. They can help here and there but I would really consider working with emotional issues and chi awareness/development (ChiDragon's advice) . Your lovemaking will improve in a natural way and you will btw learn patience which can be also a virtue in lovemaking
Technique sellers love people's impatience to get the magic bullet that will solve their problem!
bubbles