Lesbian sex will arrive soon, since I will certainly make Lucid Girls spawnable in the next version!
But for heterosexual intercourses, it will be only once Males are done (and for now, supporters are voting for me to work on the Scenario Creator customizable scene).
After that, once you can spawn several characters in the Scenario Creator, you will have to make the right parts collide with the other right parts to create what is called sex haha!