Just to see if it could be done, I did a quick ps edit. I'm happy to take it down if you like, just let me know. I was able to bring out the lines/curves of their bodies just enough by adjusting the black end of the curve adjustment. I also brightened the overall image a bit. Then added in some contrast to make the black still black. Just my $0.02.
ETA: The attachment doesn't do it justice, but you get the idea.
Could still be a bit darker and show their lines.