I Have Noticed That When I Wear Tight Pants Or

I have noticed that when i wear tight pants or trousers i get involuntary erections repeatedly. This is becoming a genuine problem as i can have say 15 to 25 a day and work in a busy office. ive tried looser pants etc but dont like feeling like my genitals are not supported. is this normal or should i maybe be looking to visit a doctor? Its only been hapening for the last year or so. Im 32 and have no issues other than this with my penis.