We're unlikely to see that, because every new body type exponentially adds to the workload. Currently with a single-size player, that means blessed nephelym scenes only require a couple of animations, maximum. That number of animations will need to be done for every size the player can be. So to use Kybele as an example, she has two player animations (one for giving and one for receiving.) If the player has variable sizes corresponding to the wild nephelym, that jumps up to twelve animations, six each for giving and receiving. Doable, but not ideal and understandable to avoid.
On the other hand, adding custom body types creates an exponential workload. Every combination needs its own unique animation. Right now we have one body type with six sizes and eight animations, meaning that to fill out all combinations as Derelict has claimed he wants to do, we have 1 * 6 * 6 * 8 = 288 hand-tooled animations. For one body type and eight sex positions. If we add in a new body type like snakes, that means we have to account for the snakes having sex with each other, the bipeds having sex with each other, bipeds receiving from snakes, and snakes receiving from bipeds. That changes it to 4 * 6 * 6 * 8, or 1,152 handmade animations. Then we add spiders, which means we need to account for spider/spider, snake/snake, biped/biped, spider/snake, snake/spider, spider/biped, biped/spider, snake/biped, and biped/snake. The numbers are now 9 * 6 * 6 * 8, or 2,592 animations made by hand. For eight sex positions.
For good measure, let's add centaurs and slimes in. That makes for centaur/centaur, slime/slime, spider/spider, snake/snake, biped/biped, centaur/slime, slime/centaur, centaur/spider, spider/centaur, centaur/snake, snake/centaur, centaur/biped, biped/centaur, slime/spider, spider/slime, slime/snake, snake/slime, slime/biped, biped/slime, spider/snake, snake/spider, spider/biped, biped/spider, snake/biped, and biped/snake combinations that need to be handled. The math is now 25 * 6 * 6 * 8, for a grand total of 7,200 handmade animations. For eight sex positions.