Is it okay for guys to wear just spandex when working out?

So I'm on my schools Cross Country and distance Track team. Many of the other boys on there will often wear spandex compression shorts or running tights to practice. This is an example:

media.scoreboardwrestling.net/.../...33350.010.jpg

They don't wear anything over that.
At first I thought it was odd because you can clearly see the outline of a guys penis through the tight fabric. I have noticed girls on the team staring at this. However, it seems like they must be really comfortable and so I am debating buying some.
What's your opinion?
Yes
No
It should be illegal.
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Is it okay for guys to wear just spandex when working out?
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