This is an incomplete rendering of the Great Tradition of Tantra.
Tantra Yoga is a Yoga primarily involved in the process of releasing Life-Force (within the psycho/physical body more commonly called sexual energy) from the knot or cramp of self-consciousness. It is not, in the first place, simply or merely a yoga to enhance or stimulate sexual energy for the sake of bodily sex with another.
Yes, these retreats are Tantric in the Great and Ultimate sense in that my purpose with you is primarily the Work of assisting you to release sexual energy from the self-conscious knot.
The enlightened interpretation of sexuality is an interpretation that understands that you are not a problem. In this feeling of no problem you will uphold a full and constantly renewed sense of vital well being.
This means that your interactions will be open, full and life giving (unselfconscious) not closed, weary or life diminishing.(self conscious).
This means you will have to have a love and passion for something greater than your perceived limitations...