How were you diagnosed with NGU?
It was NOT caused by a handjob or mutual masturbation. No STD is transmitted by toughing, including HIV. I'm including several links that explain why.
NGU can be sexually transmitted, but there are lots of causes that aren't. Very simply, it's an infection in the urethra that isn't gonorrhea.
https://emedicine.medscape.com/article/438091-clinical#b5
"Commonly identified causes of NGU include the following:
Chlamydia trachomatis (15-55% of cases)
Ureaplasma urealyticum (40-60% of cases)
Mycoplasma genitalium (15-20% of cases)
Trichomonas vaginalis (< 5% of cases)
The number of fastidious organisms implicated in NGU is increasing and includes several Ureaplasma and Mycoplasma species. The causative organism cannot be identified in most patients with NGU.
Rare cases may be related to lymphogranuloma venereum, herpes simplex, syphilis, mycobacteria, or urinary tract infection with urethral stricture. Other rare but reported causes of NGU include anaerobes, adenovirus, cytomegalovirus, and streptococcus."
You can get it from oral sex, too.
Here are some posts from our experts (when we had them) that may help -
https://
www.medhelp.org/posts/STDs/Nervous-about-mutual-masturbation/show/2183476
https://
www.medhelp.org/posts/STDs/Mutual-Masturbation-STD/show/1968429
https://
www.medhelp.org/posts/STDs/mutual-masturbation-sti/show/1858544
https://
www.medhelp.org/posts/STDs/Understanding-the-risks-of-mutual-fingering/show/1516796
https://
www.medhelp.org/posts/HIV---Prevention/Vaginal-fluid-on-hand-touched-inside-of-condom-and-head-of-penis/show/1119533 - read this thread thoroughly. There is an excellent explanation about why certain activities are not risks, and why others are.