Thanks for your answer!Not sure, but it could be a problem with polygon collisions (I mean when some polygons going through another). Check if this cum prop is going through the body itself, and if so, try to offset it a little bit.
Check if this prop has "expand" adjustment and play with it, or just move it out of body with "Translate Tool".
I often use this to improve render times, love it.Good asset I use the shit out of it, but bigtime texture heavy if you add shit to backyard.