Woman thinking about MMF double penetration [M]

My GF grew up having had a older friend (f) finger her and eat her out for years. They would make out at times but that stopped once gf had a bf. Fast forward to present day. Gf finds mmf porn attractive and likes ffm as well. She even has said that she doesn’t know if she could do it in real life but she would live to experience mmf and ffm at least once. Her and I (m) have had tons of sex and we’ve done anal a couple times but it’s not her go to like I’m excited to get fucked in my ass kind of thing.

So these are my questions.
1.) do a lot of women think about mmf?

2.) why would a female be intrested in dp if she doesn’t really like anal to begin with? (Could it be the pressure between the rectum wall and the vagina that is a turn on?, does that feel better?)

3.) women that have done mmf do, do you like it, and why do you like it? Details please.