Regarding point 1:
I saw some behind the scenes excerpts that had to be interrupted because of their fits of laughter. Unfortunately, you can't find that many BTS with Sara on the relevant sites anymore. However, Porno-Dan also said this in an interview a few years ago, that she was very sensitive in her intimate area and that filming was interrupted every now and then.
Regarding point 2:
I can't confirm exactly whether she is or was married, but she was in a relationship throughout her entire career. She retired in 2007 due to her pregnancy, which also left her with a cesarean section scar, and returned in 2009. One reason why she unfortunately finally withdrew in 2011 was probably her second pregnancy.
For well-known reasons, I can't say anything about the two remaining points, as I haven't followed their same-sex films. I only know the scene with Nina Hartley and one with the equally divine Avy Scott. So unfortunately I can't judge this. I hope to have helped you. Best regards