From: Post orgasmic illness syndrome: what do we know till now?
One or more of the following symptoms:
Sensation of a flu-like state, extreme fatigue or exhaustion, weakness of musculature, experiences of feverishness or perspiration, mood disturbances and/or irritability, memory difficulties, concentration problems, incoherent speech, congestion of nose or watery nose, itching eyes.
All symptoms occur immediately, soon (e.g., seconds, minutes) or few hours after ejaculation that is initiated by coitus, and/or masturbation, and/or spontaneously (e.g., during sleep).
Symptoms occur always or nearly always, e.g., in more than 90% of ejaculation events.
Most of these symptoms last for about 2 to 7 days.
The symptoms disappear spontaneously.