As a frequent patient these last few years, I can confirm that YES, letting loose with a good run of "f--k f--k f--k...." is extremely therapeutic mentally, and also therefore physically. If I have the opportunity though, I will ask permission first. Like the first time I had my first NG tube pulled out. I said "wait, do you mind if I swear? I think it might help a bit" and that wasn't the only time. They never say no, it's always "if that helps you get through this, you go ahead and do it".