Darren's Mensniche have a few sites on this topic.
Mens Niche
All their stuff converts like crazy =)
ultimate sex guide
sexposition guide
karma sutra guide
tantra guide
Apart from Mensniche, you could try
Top Bucks (How2PickUpGirls and How2PleaseHer)
Weg Cash (Satisfy Your Lover)
They both have some be a better lover guides