Ok, now I’ve watched it, I can see that the guy at 54:20 is actually not her first uncut experience because the guy at 41:50 is. She even comments on it, asking him if he’s uncircumcised and then saying “I like”.
At 1:10:20 she mentions experimenting by pulling a guy’s foreskin forward and sticking her tongue inside but I didn’t notice her doing that.
I’ll update the times in the OP.
