When I was a VIP member at milky-cat.com I remember reading the description of Tsuna Kimura's movies. They mention that Tsuna originally wanted to do an extreme bukkake earlier in her career but Shirou (guy behind milky-cat) didn't want to scare her out of the JAV industry so told her to shoot for other studios for a while before coming to him. It also mentioned that Tsuna-chan's boyfriend is a big fan of milky-cat and it was super exciting for her to shoot for them.
I'm not sure how ideal that is for me or most people but he sounds like the luckiest (or unluckiest depending on your view) guy on earth. I mean the idea of dating such a kawaii sperm whore is such a turn on (even though such a relationship is probably not for everyone). I'm not sure how I'd react if I had a girlfriend doing that stuff, but I must admit I am super jealous of Tsuna's boyfriend because milky-cat is my favorite studio and having her as a girlfriend sounds like such a turn on.
So I certainly think its possible for them to have relationships (whether they are healthy or not is a different question) BUT, depending on the people involved I'm sure there are some that work out well. Like Tsuna and her lucky asshole boyfriend! (So jealous, lol).