The Muslim should refrain from obscenity in all his dealings, whether that has to do with words or deeds, but if he cannot reach a permissible objective without mentioning something that people usually feel too shy to mention, then it is acceptable. It says in the hadeeth of Maa’iz that the Prophet (peace and blessings of Allaah be upon him) mentioned some words that he did not ordinarily use. But if there is no need for that and those words are not haraam, such as swearing and insulting, then it is better not to say them. In that case they are more likely to be makrooh. So in that case there is nothing wrong with saying what was mentioned in the question, so long as the husband and wife do not use the same kind of words in front of their children or anyone else.