I do it mostly when I'm with my friends and for humor, If someone wants me to stop or if it's an inapropro time then I won't.
If you see me cursing in rl, I seem like a mad ass Asian granny. :|
For fun when I'm with my people & of course when i get angry , when it comes to betting on my games , I'm always cursing , money on the line & your team is loosing , come on now ! .
OT: I don't think I ever do it in conversation; simply because it's not me. Now I may do it when I stub my toe, trip, nearly hit by a car, or attacked by a bear. Ya know, things like that. I may sometimes do it out of excitement as well, like once upon a time when I liked football, I may curse if my team was losing or did something stupid.
I disagree with that example though. In your example, 'Please' is unnecessary if you really want that person to not do it. The tone of the voice would also help. But yeah, I get what you mean.