Occurs during a one night stand, usually alcohol and the lowering of standards are a major factor. This is the moment immediately after ejaculation, when the man realizes the horrible mistake he's made/situation he's in, to which he had previously been blinded by lust. After one cums to their senses, they typically conclude that they don't want to be there at all, and their mind immediately begins to race, looking for a way out or an excuse to leave.
-I told her I had to leave to teach Karate class, I didn't know what else to say!
-Well, way to cum to your senses.