A question for women: what turn you on more

Hi, we're just dipping our toes in this type of enviroment, my gf (26) and I (27) have untill now only had sex in the same bed with other couples and we touched a bit each other. My gf says it's not so easy for her to be sexually attracted to other men, do you feel the same? When you swap, are you more focused on your husband, on the phisical sensations, on the man who is fucking you...?

Also a bonus question: if you know the Milan (IT) area, what's your favourite club there? Thank you all!