Put the picture into photoshop or similar and adjust the contrast and lightness etc.
None of the pictures that I have seen concentrate on the lower regions, preferring eroticism rather than a wide leg spread.
http://www.opium.se/viewtopic.php?id=20400
pictures of the lean-on-me movie
http://tour6.met-art.com/c106/05036-Anna-by-NatashaSchon-164.jpg
ANNA S PERSEA BY NATASHA SCHON
http://portal.nigmae.net/2006/05/22/metart__may_2006__week_3__28_hq_sets.html
(scroll down)
http://portal.nigmae.net/2006/05/10/05252005anna__alessandralean_on_methe_photoshootby_pasha.html
http://www.art-met.com/met/327/06artmet.html
http://www.met-art.com/c106/06186-Katya-Anna-by-NatashaSchon-97.jpg