Let me tell you something... I have my own unusuall fetishes that I wont talk about because some of them are really triggering for some people. But i can say i mastered my fetishes and my erections. Im still fighting with my hormones (im 14) but if i do get a unwanted erection i can get rid of it. For an example. Youre at school. Focus at the things you learn. Focus on the class... I just try to picture my old teacher naked and i get rid of my erection... xD but you know what im talking about...
[Edited] Because erection does happen because of a sexual sitmulation (physical or psyhical) but yeah, its all in the head... That was my point...