Work colleagues talk dirty all day!!!?

It's very distasteful and I feel for you. They probably see that it embarres you and do it on purpose. Some people do that kind of stupid thing; it's a type of bullying. Try not to show how you feel and and practice looking them directly in the eyes without embarrment, and raise your eyebrows without making any comment, they will feel foolish and soon stop. You can practice the look in your bedroom mirror. Be your usual polite and pleasant self and they will soon see how boring they are.