Here's the situation: You're a diligent and thoughtful networker, trying at all times to help your networking contacts with introductions and contacts. When you can do so, you make direct introductions to potential clients; at other times, you help people get connected to other influential connectors and referral sources. You're fairly diligent about it, and not a week goes by without some sort of introductions being made.
And you don't except anything in return. Well, not really. So, does this describe you?
If so, then you know that at some point you might want/need to be so forthright as to ask some of your networking contacts for specific introductions for yourself, maybe not to a specific company but perhaps to a suitable category of business.