Thank you for all the replies everyone, seems I have probably discovered all the resources that I am likely too.
My understanding is limited, I am currently doing research as it's something a guy I am involved with is very interested in us exploring together.
But for the most part it seems to be focused on slowing things down, learning to focus on each other during sex, it often leads to deeper and more prolonged orgams. instead of orgasms being the end goal, the whole process is the main events so to speak.
There is a lot of spiritual/religious teachings inter woven with it too, but I think from what I've read it is possible to use some of the physical practices to enhance sex without necessarily following the spirtiutal teachings.
But as I say, I am learnng and researching, so I'm sure someone may correct me on all of this.