Now, this is quite a fucked up one. Don’t question me why, but there just is something about reaching a most inner part of a woman with something. Now be that some kind of parasite/slime/whatever reaching the womb, or it is getting penetrated by anything, or something getting inserted into it. For me, especially the concept of anything getting inserted into there, makes it rather, I guess, special. A different side of this concept is, of course, the idea of Unbirth where some kind of lifeform gets put into the womb. All in all, EXTREMELY weird and most people will probably hate it.