IOIs are conscious, and often unconscious, actions that an HB takes to communicate her interest in a man. Most AFCs are ignorant of IOIs, but, with training, a PUA can begin to see the subtle signals that a woman may be interested in him, which can lead to warmer approaches.
HB sees you and holds eye contact, “come talk to me” look (AI)
HB scratches her hand, touches her hair (unconscious physical)
HB complies with a request (compliance)
HB says she likes something about you (verbal)
HB pushes up her breasts (sexual escalation)
Sometimes women can throw out fake IOIs, which are not genuine indicators of interest but ploys designed to deceive a man into doing favors for her. Field experience and calibration will enhance a PUAs sensitivity and understanding of genuine IOIs.
It is not necessary for IOIs to exists for the PUA to escalate. All you need is continued compliance (i.e. she doesn’t say stop). As you get better the social cues will become easier and easier to read.
That girl is throwing me IOIs like crazy; I should probably kiss her.