Rocco was probably paying them many €€€ to do this...plus he was super-enema'd...plus his boyish Italian charm persuading them...good luck!
No harm in asking a girl who rims if she's willing though! One girl I knew just rimmed me without asking or prompting, seemed to be her thing...she was the only one who did it to me, thankfully I was clean, just showered...she's sadly not available now though.