I use Blockhead. I set it up for a different body type for each race. Works great when they are wearing their underwear, but when nude for sex the males are only seamless with the default muscular, regardless of individual settings. I have reverted to using default muscular for all the standard races and only a different body type for my custom player race (SLATH). The match is not awful, but it is not as seamless as the standards using Default muscular with the muscular body type. (It took a bit to get your program to work for me and I thank you for it, but I just could not get the tops and bottoms during sex to match across a while spectrum of races with different body types)