I dont knwo wether anyone knows what I mean, but you know when a gy is shagging a girl and you can see his cock is a bit big for her and her pussy lips are just pumping, a bit like this pic..
Do an askjolene search for Lily Thai, or go to your favorite link farm and scan through the thumbnails to find ones where the girl's pussy lips look stretched out. You will be rewarded
You'll also find it in many of the interracial scenes where the male is black.