As for the jurists who do not rule that the permission of a girl's father is required, what’s Sistani’s view on this? Also if the girl has not been in a sexual relationship with another man before, I’ve heard that you can’t do Mut’ah with her, what’s Sistani’s view on this too?

Sayed Sistani’s view is that father’s permission is necessary in all cases for virgins, and also for those who have lost their virginity outside of marriage (in other words through zina).