Hi Saraid. I have a couple of suggestions, but they don't relate to positioning during sex if that is what you were after. I also don't think the resources are available on eden. I did enjoy a video called Tantric Sexual Massage for Lovers in the 'loving sex' series. Invoves explicit demos of female and male g spot massage, male and female extermal genital massage, but starts with some full body massage techniques and there is a reflex spot next to the achilles tendon.. squeezing behind it about three fingers up from the ankle is supposed to work to stimulate sexual energy, but I haven't had any luck. Might work for some better than others. Also nipples, sacrum, and a couple of back massage techniques. I have known for a long time that the area of the sacrum is a great spot to get me going even before watching the dvd, so I guess I felt happy that a tantric resource recognised it. So I guess tantra is influenced a lot by non genital erogenous zones and reflexes. There is likely something comparable here on eden.
If it is energy work you are interested in the books the multiorgasmic man/woman/couple by mantak chia are taoist instead of tantric but might be a good option especially if you're interested in male continence- it can be very 'rulesy' but it is interesting and is something I have been looking at for a while. Again it doesn't provide a great deal in terms of positioning. It was the novel Island by Aldous Huxley which really got me interested in learning more about male continence related to tantra. At least I *think* it is a part of tantric practice. It refers to a yoga of love as 'maithuana' from the tradition of Mahayana Buddhism that had also been heavily influenced by tantra. Eastern religions seem all to have very similar bases of knowledge regarding sex, but I haven't been able to find anything about male continence in actual tantric guides.