I usually am the opposite at my gym... wishing I was hanging longer and lower after a good workout to look "respectable" and then I look down and say, "where did he go?" LOL
I think if you are nonchalant and don't make a spectacle, you're fine. If you start walking around with your hips thrust forward like you're a divining rod looking for a water source, then you'll incur the wrath of those inclined to feel angered or threatened. And by all means, PLEASE COVER UP IF THERE ARE MINORS PRESENT- not because you should be ashamed, but because you probably shouldn't be in the role of male role model in that situation. If others see you with a kid staring at your bone (and they will every time), you'll just be opening yourself up to a world of problems.
You're human and a dude, and we all know that sometimes they do indeed happen unexpectedly. Any guy should know that and won't immediately judge a gym shower boner as a sign of anything more than blood flow from a good workout. As I said before, you're judged by how you ACT with that boner.
EVERY GUY looks at gym cocks- every guy compares. Only the confident will admit it. That being said, probably 75% of the guys who see you will fall somewhere on the kinsey scale and actually LIKE seeing your bone. (Just remember- not everyone who appreciates seeing it would want to touch, feel, or get on it!) So you can be proud that showing a good semi is basically going to only have a negative reaction with 25%... and maybe another 15% of these guys are going to give you the benefit of the doubt as it just being a stray bone.
The bottom line is, get yourself groomed and get your body athletically fit- ht/wt proportionate, and, if necessary, make some use of your towel to maintain some minimal modesty. If you show a big bone, hey- it happens. As others have said, it will fade over time (damn it)
