Very interesting. I had a real problem with recurring UTIs a couple of years ago -- I tried cranberry juice, antibiotics, everything. Antibiotics made them go away, but they'd just come back again a few weeks later.
Honestly, peeing after sex seemed to be the ONLY thing that helped me break out of that miserable cycle of non-stop infections. I used to get them all the time and now I haven't had one in years. But maybe something else was responsible for the change?
At any rate, cleaning up beforehand seems like a good idea, too. I'll have to keep that in mind.