It‘s not always bad~It just a special emotion between male-female. In general ，the relationship is better than friendship，lower than love (usually，theirs deeds looks like falling in love or will be falling in love .) For example： A male-female have a 暧昧 relationship,but the male has another girl friend. We often think that’s bad. A male-female look like have a 暧昧 relationship， but they don't recognize that they are falling in love and say they are just friend. In this case ，some one perhaps think is bad ，because they think they aren't honest . But if some one believe they are just good friend，the 暧昧 of course not bad. A male-female have a 暧昧 relationship from their childhood . And they become husband and wife. This 暧昧 is good，often we admire it .We have another world for it in this case .The world is 两小无猜. I am a Chinese ,so my English is poor . If my express has some mistakes ，please give some advice ，thank you.