Current ratingGeneral Surgeon, Dr. Mukund Savaskar's Response
Hi,Dear,Thanks for your query to HCM.
Dear I read your query and reviewed it with context to your query facts.
I understood your health concerns and feel Concerned about them.
Based on the facts of your query, you seem to suffer from-
Urgency with 
Incontinence with discharge from peribulbar periurethral glands which have got STD affliction in the past.
So when you do have sex, the parasympathetic stimulation to periurethral glands,which are inflamed already, secrete flush of white fluid, which mixes with seminal overflooding due  to its inflammation,and this adds to urinary pain from the irritant urethra and urinary sphincter with irritant bladder muscles,causing Urinary Incontenance and 
Urinary Urgency in your case.
CT 
prostate and  Contrast Bladder/ urethrography studies would confirm inflammatory anatomy of Lower 
Urinary tract. 
Second Opinion from Urologist with LCr test of Urine  and blood would fix diagnosis in your case. 
Hope this would help you to treat your health issues in the best way possible.
Welcome for any further query in this regard.
Good Day!!
Dr.Savaskar M.N.
Senior Surgical Specialist
M.S.Genl-CVTS