This article is from the Magick Tantra FAQ, by Tyagi Nagasiva email@example.com, Catherine Yronwode firstname.lastname@example.org with numerous contributions by others.
The stated goals vary by the branch of tantra or tantra-like
sexual-spiritual practices of non-Hindu cultures one is
considering. They range from literal union with the godhead
to enjoying sex more, with plenty of stops along the way for
intermediate goals. A good middle ground may be to
experience spiritual bliss through sexual pleasure, to
witness the incarnation of deity in one's lover, and to
experience union with that divine incarnation on all the
levels of visual, emotional, mental, physical, and
spiritual existence which one can perceive.