DS can't string a sentance together without swearing

[NAR4]

My 14 (15 next month) old DS swears A LOT. He does it so much that I really think he isn't even aware of doing it most the time. Despite constantly pointing it out, giving out punishments and asking him to stop, he carries on. My concern is that my 2 yr old will soon start saying the words because she hears them so much. How do I stop it?

you need to make him stop.
DO you swear? How did this even start being acceptable?

My DH and me do swear occasionally, but not in general conversation. It has never been acceptable for him to swear, just that he ignores us telling him not to. None of my other teenagers swear. His behaviour in general is not good (a few different behavioural problems) but this one I feel will have a particularly negative impact on the younger children.

Does he get any pocket money ? I started to fine my dc for swearing 10p everytime, it can soon add up to quite a lot , and I took this off their next week's allowance

He doesn't get pocket money, we pay so much for hobbies already.

Which swear words does he use?

The racist words and the c-word are completely unacceptable, IMO. The rest are pretty standard for people to use, I'm afraid. People might think he's odd if he doesn't swear.

You could threaten to wash his mouth out with soap and water!

Its the F word that he uses all the time. It is the way he uses it that really annoys me. Its not when he stubs his toe or something. Its just used as part of an everyday sentence eg whats for f...ing dinner? or wheres my f...ing school bag? I could tolerate a teenager swearing occassionally when they have lost their temper but not just used as part of their everyday language.

I am a youth worker and agree that it seems to have become fairly common behaviour now, among teenagers. Having said that it isn't behaviour I want to continue in my house. I'm sure he isn't doing it in his classes at school! If he wants to talk that way when with his friends, fine. It isn't in my ear shot (or that of his younger siblings), just not at home or when out with the family.