The leads on a crime drama or procedural. This is a male-female relationship, and the duo is usually, but not always, in a law enforcement profession. They do not have to officially be partnered together as long as they don't work with anyone else more closely than they work with each other. They're like the partners of a Buddy Cop Show only, you know, different genders. This trope doesn't tend to pop up on ensemble shows or shows that only have one lead, such as House or 24. Relationship strength comparable to Heterosexual Life Partners and Platonic Life Partners but with sexual tension.