Thanks David Herridge, I must admit that my first introduction to slow sex was through a tantric teacher (Diana Richardson) and her book Tantric Orgasm for Women. She has many other books as well, and I really connect to the way she teaches.
However, the most important thing for me in Tantra is the dropping of the goal while having sex.
And many Tantra teachers still are very much goal-oriented, especially toward different orgasmic experiences.
I wrote a little about my disappointment with different so-call Tantric teachers here, if you are interested.