I recently developed a discharge from my penis. It was like a clear watery liquid during the day, but first thing in the morning it was more milky colored.

I visited my local genitourinary medicine clinic and found I had non-specific urethritis.

I am mystified as to how I got this infection as I have only had sex with my regular partner (who has also only had sex with me).

He went to the clinic and had no sign of any infection. How is it possible to get an infection like this if it is not sexually transmitted?

Could it have been from the extra amount of sex we had (together only) while we were on holiday?

Hope you can shed some light.