>>2780000You simply need some spatial awareness to understand that your goal is to keep the lower bodies or genitals in contact with each other. From there, the logical solution is to maintain the relative positions of the corresponding bones throughout the scene, with optional reciprocating motions and other deviations to make it more natural. This can be achieved in three ways:
1) By attaching the lower body or genital bone of the female to the corresponding bone of the male model (might need to assign an external parent key). You need to keep the relative position, so the center/groove/root keys (and anything else that could shift or rotate your target) will likely have to be deleted / replaced with sexual back-and-forth movements. Leg movements will also have to be edited in most cases. Still, you get possibly the easiest option of the three—but it can cost you a lot of computing power.
2) By fusing the models in a model editor. Prepare for a bunch of complications stemming from duplicate body structures, assuming you want to retain their original functionality, like in the example video.
3) By aligning the root/center/groove/waist/lower body motions of the two models without attaching them to each other. Expect it to be more difficult than (1), unless the root/center/groove/(waist)/lower body relative positions match between your models.
