I’d like to disclose that I had this issue. So I did my research and found the solution. After my marriage, the pain vanished.
Erection
 happens on many occasions, but the testicular pain mentioned above 
happens especially when you are around your girl friend. Especially when
 you are just kissing or cuddling her and not doing a sexual 
intercourse. The pain suddenly develops on your one or both testicles 
and may radiate to lower abdomen, for usually around 15 minutes to 2 
hours. Even while i was talking stuffs to my girl, I experienced this.
On other occasions like while watching a porn movie, it never happened. That sounds weird right?
Relax, its totally normal
Guys,
 this is not a big issue. Cool down. Its just another fuckin natural 
phenomenon. Most of the boys who can be easily aroused, experience this.
 But most of them hesitate to disclose what they have.
But some guys need to stand up, and that’s why I’m here with the subject.
The Real Reason..
When
 you are talking stuffs to your gf or kissing or cuddling her, you get 
aroused and there will be increased secretion of semen inside your 
testis. As you are not doing intercourse or other ejaculation methods 
like masturbation, the pressure inside the testicles increases and lead 
to acute pain. And later the pain radiates towards the lower abdominal 
muscles. Its just that simple, but it aches like hell..
Kindly do not avoid your girl for this, who knows nothing about such stuffs. Its hard to get good partner these days.
Slang and Tech terms for it
Epididymal
 Hypertension a.k.a “Blue Balls” is a testicular aching that occurs as a
 result of blood being accumulated or retained in the male’s genitals 
after prolonged sexual arousal and is not dispersed by an orgasm. The 
term is thought to have originated in the United States, first appearing
 in 1916. 
Best Remedies
- Masturbate before the pain starts (the best option).
 - Prostrate Massasge — https://en.wikipedia.org/wiki/Prostate_massage
 - Explain everything to your gf (no need to be shy)
 - Ask her to do an oral sex / intercource, if possible (I dont like anal. LOL..)
 - If
 pain is due to irritation of some nerve, try Tab. Neurobion Forte (Do 
not forget that only your doctor can find it and prescribe any drugs).
 - After marriage, it will reduce. Don’t worry.
 
The holocaust
I know some guys who consulted doctors for this. And the docs advised Ultrasonography (USG scan) and found nothing. FOOLS..!
Surprisingly, some doctors even conducted surgeries, stating that the condition is TORSION OF TESTIS.
Bigger FOOLS!
Few words about TESTICULAR TORSION
Torsion
 of testis is a serious condition. It happens when the spermatic cord 
twists, cutting off the testicle’s blood supply. There will be severe 
pain and enlargement and discolouration of testis. If surgery is not 
done immediately, may lead to
- Testicular infarction
 - Scrotal abscess
 - Gangrene of testis
 - Recurrence
 - Chronic epididymitis
 
So differential identification of bath cases is very important.
And torsion of testis is not associated to your girl friend.

