Thread:50.100.54.1/@comment-828185-20141222172254/@comment-828185-20141222211015

I guess you got this from Google translate.... It is true the the terms you mentioned can be can be translated in the way you suggested. However depends on the situation, the meanings can change...
 * 不好! - Can be used to described something as being not good, but can also be used for exclamation. In this case its meaning is more similar to "Oh no!"
 * 性交 - As you suggested, it means sexual intercourse, but I guess you know the word "F**K" can also carry the meaning of having sex, so the translation is correct
 * 他妈的 - In is a very general term used for swearing in Chinese (Mandarin). The character 他 means his/her, and the 妈 means mother. 的 can be roughly translated as "belongs to". So a more accurate translation would be "His/her mother's..." "Your mother..." can keep the roughly keeps original meaning while suggesting it is a swear word.