Copied from Blue Ball 
(The issues of this language are unrelated to disambiguation, but should be consistent with the article Blue balls.)

The following appears on Blue Ball but is more efficient to discuss here:
"Blue balls" is a modern slang term for a minor cramping men may get in the groin after they are sexually stimulated for a prolonged period but do not ejaculate.
(t) 21:28, 2004 Mar 16 (UTC)

Dorland's Illustrated Medical Dictionary conforms to common sense usage in saying a cramp is "a painful spasmodic muscular contraction", and the groin does have muscles.  But blue balls is not a cramp, but an ache in the testicles (whose musculature is insignificant at most).  Ellis emphasizes "congestion", which i take to imply that the pain reflects failure to release the eleveated local blood pressure resulting from failure to relieve the engorgement of the genitals that is crucial to erection, i.e., a condition related to the "pain and tenderness" of priapism.  (It may be informative to consult side-effects information of Viagra and its competitors, some of which are effective for 3 days and advise medical care for erections lasting over 4 hours.) (t) 21:28, 2004 Mar 16 (UTC)

Further, the term ejaculate, like the earlier "release semen" (that a well-intentioned editor  used to replace simply "release"), misleadingly suggests that fluid pressure of seminal fluid is at issue; i think research will show that there is no significant seminal pressure except that imposed in pulses by the prostate during ejaculation.  The real issue is indeed plain "release", or rather release of either sympathetic or parasympathetic (never could remember which is which) nervous-system excitation, which in turn entails destimulation of sphincter-like structures that sustain the engorgement (and that ED-medications work by affecting).
(t) 21:28, 2004 Mar 16 (UTC)