use sellotape and stick your penis to your at a horizontal angle to your body nice and tight.
No more embarassing erections. Make sure you pee first OR use a catheter and you'll be fine. Watch out when removing sellotape. It may sting a tad even if you are unshaven
seriously don't stress it's perfectly normal.
PS if you start drooping then a stick from a lolly and some sellotape will hold up a less than firm erection