Yes, they have sex.  The male implants sperm into the female, who then sometimes then uses her lover to cure the "post-intercourse munchies" (that's the technical term of course), then she lays eggs.

 Umm... Well i think they kiss and then scream in each others faces. This creates a bond between them and then gases are exchanged and the biggest spider becomes gradually pregnant. They store the babies in their eyes and give birth through their mouths.