I am a 24 year old straight male and I went for a professional sports massage earlier today at a university clinic. A male therapist had me undress down to my briefs and gave me a very relaxing massage. The problem, however, happened about five minutes after he started, when I started to get an erection. When I had to turn around and lie on my back, my erection was really obvious, and clearly visible through my white briefs. The therapist didn't say anything about it, except telling me to just relax and loosen up. He could feel that I was getting tense and nervous. Is this normal and should I avoid getting massages in the future for fear of another erection?