Everyone seems keen to make light of what I assume is a serious question. I am sure that your rersponse was nearer to the previous Answer - erections can be caused simply by the close proximity of another human being - it doesn't infer sexual attraction. I have felt an erection kissing my daughters goodnight, and I am sure there is no hidden agenda there - it is simply a reflex response to an influx of feeling. If you have experienced no other inclination towards men, just put this down to a learning experience, and treat it for what it was, a simple biological reaction, without any inference of sexual interest what so ever.