Read this link:http://www.kundalini-tantra.com/aspect8.html
Quote:
Entering into any of these aspects of sexual intercourse is considered as having entered into some portion of sexual intercourse itself. This is not just according to Vedic Tantra but also according to most religions and it is noted in the Bible that even stage one (thinking of sex) is a sin (see Matthew 5:28). Well, Tantra does not consider sex a sin so those of you who are reading this have just been absolved of any sin for thinking ?unclean? thoughts.
What a strange thing (unclean) to call any creation of God which is so integral to our human functioning. Through this ?unclean,? ?dirty,? ?filthy,? and so on method are our beautiful children and the Children of God conceived.