Kpfeif,

    My symptoms started just like yours after getting into mountain
biking.  I did not make the connection however until my latest fare up
which has resulted in a minor but permanent condition.  Here is my
advice.  It is unlikely that you have an infection your problem is
more likely than not related to your pelvic floor muscles and nerves.
Do not take antibiotics unless an ejaculate, eps, and/or urine culture
indicates an infection.  I did not take these initial steps and
suffered through heroic doses of antibiotics with no significant
change in my condition, in fact, I blame failure to treat properly
with prolonging the condition.  If you get the above test performed
and they do not grow significant infectious organisms then do not take
antibiotics.  My recommendation is: 1. stop all bicycling; 2. avoid
all deep hip flexion activities, i.e., sit ups, squats, running, stair
climbers, etc.; 3. get your doc to give you high dose non steroidal
anti-inflammatory like vioxx, celebrex, ibuprofen; 4. avoid excess
sitting or if you must sit get a cushion that does not put pressure on
your perineum; 5. practice pelvic floor relaxation and find a pelvic
floor physical therapist.  It will take you at least three months to
feel better and you may never completely recover but you should
improve substantially.  I do not believe the flare up after cycling is
incidental and would bet your problem is related to your pelvic floor
as was mine.  Try to avoid all the trash advice on this forum related
to hidden stealth infections and auto immune conditions as the cause
of your problem.  Also, take herbal supplements with caution.  They
are expensive and in my experience do nothing of benefit.  Your
problem may be your prostate but I doubt it.  It is always best to be
conservative yet diligent.  I wish you well and post follow up if this
advice is helpful.