I reccomend using this as a reference to help draw hands in sexual positions faster. This product has 4 png files (the ones shown in the samples), and will also come with the original CSP file.
Each hand has vector line art with a layer filling in the color that you can adjust accordingly.
size:
17 in x 17.3in at 600 dpi
No credit is necessary.
You may use this however you like.
(English product description provided by the creator.)