When going to pee..

Always undue my belt unzip and let it all out! I always laugh wheni piss and it looks like the guy in the picture above hehhehehe
 
If boxers A - Release your penis through the flie hole in your underpants/boxers

Do this at times at the gym - B) Pull the crotch fabric to one side and release your penis through the left hand leg hole

Do this at times at the gym - C) Pull the crotch habric to one side and release your penis through the right hand leg hole

with boxer briefs - D) Pull your pants/briefs down and pee over the top of them
 
A. Use the fly with boxers and pants or jeans that zip - mostly at urinals. I don't wear jeans or pants at home.
C. When wearing boxers with gym shorts, simply lift the right leg up of both the gym shorts and the boxers simultaneously. Works great!
D. For sweatpants or track pants, grab the elastic waistband of both your pants and your boxers, drop 'em, and let it rip.