I think early on, but after that, was at my first job, I went in all fresh faced an innocent (ok ish lol) . I went into the locker room on my first day to find they had showers, thinking nothing of it, got changed and started work, never saw anyone use them , but a few weeks later got there an hour or so later as I had a dental appointment. As I opened the locker room door I could hear the shower running, my locker was about 10 ft or so from the showers, all individual, but just cubicals, so typically you would get dressed at your locker. I notice one of the guys I worked with must be in the shower as his locker was near me, so working in the same area I did... I couldn't remember whose locker it was, until I saw him walking naked out of the shower, he was perhaps 5 years older than me, and I fancied him like crazy I couldn't believe my luck that I got to see him naked, towel around his waist but showing a big bulge, I sad hi, I tried not to stare too much but could feel my cock growing. He walked to his lockers and took the towel off and put it on the bench. And there he was totally naked, I had wanked so many times thinking of him when I saw him in his bulging undies and now he was totally naked.. I saw he was very well divined, but I knew that anyway, I saw he was well hung and he had a semi, oh fuck, I was in danger of either shooting my load in my pants or grabbing him, I had to look away, and think of something to calm me down... we made conversation as I fumbled in my locker, I turned away and adjusted my cock. I said I would see him later and locked my locker and dashed off, but not before taking another glance at his lovely 7 inch semi, omg... that was a day that was used for wank material. I was assigned to work with him through out the remainder of the day, as we were both in later. My mind kept giving me images of him naked... I am sure he knew I fancied him, but as I wasn't out then, but always got on with him, with what I felt was flirty banter, but perhaps he felt was ladsey banter.