When I climbed on to the model stand naked for the first time I had to concentrate on not getting aroused, I was successful but it was not easy . I focused on providing assortments of gesture poses and longer poses that showed emotion and were interesting to draw. My confidence in my abilities was high. My ability to ward off spontaneous erections the moment I felt the stirring inside. That all changed while posing for anatomy class, of all times. While standing on a box and students enthusiastically huddled around me as the professor identified the external structures of the male reproductive organs using a pointer. This was far different than what I was used to in drawing classes. I felt cool morning draft from the open window when I felt a tingle, my scrotum tightening , no , not now. I was developing a erection and I could do nothing to stop it. Within seconds, my penis was lurching furiously to the beat of my heart which I could actually hear. I closed my eyes, blushing, I thought, I am fired I know it. To my surprise I heard the professor say oh, wonderful, here we can see the significant changes during arousal. Note the tightening of the scrotum as the penis prepares for ejaculation . With all eyes on me, studying every detail. I continued the pose even when I felt flow of pre-cum flooding my eurethra. I have experienced the most intense arousal ever while posing.