From - The Ananga Ranga
Uttana-bandha (i.e., supine posture) is the great division so-called by men well versed in the Art of Love, when a woman lies upon her back, and her husband sits close to her upon his hams. But is this all that can be said of it? No! no! there are eleven sub-divisions: ...
#9 Veshtita-asana, is when the wife lies upon her back cross-legged, and raises her feet a little; this position is very well fitted for those burning with desire.