Cock-Conduit

Exact opposite of a cock blocker. A friend, family member, or acquaintance of a female who facilitates/ makes it easier for a guy to get laid via verbal communication(s) or some other action(s) toward said female that are in the guy's favor.

Eric: I met this really hot girl at the bar last night.
Seth: Nice!
Eric: This girl she was with was cutting me off any time I tried to talk to her and tried to stop her from dancing with me.
Seth: What a cock blocker.
Eric: Yeah, but her other friend was totally different. This friend actually told her I was good looking, how I had a nice body; and since I was wearing sandals, she even commented on how long my toes were.

Seth: Wow, that's a cock-conduit right there!