The files in that folder are SEXSIM files, and I think you'd need Jak's editing tools to alter them.
In the 'data' folder in there there's some XML files you could modify, but they only cover the tweaks of the basic animations, so the characters would be in the same pose but you could change their facial animations and how much their boobs/butt jiggle.
I remember trying to copy/paste the 'cumemit' section from the blowjob file into the missionary file (after making backups first, of course!), see if I could hack together some sort of rudimentary creampie, but it didn't seem to have any effect.
I did happen to notice that the facial animation for 'blowjob' when you take the guy away looks pretty happy, I might see if I can transplant it to something else now :p