Why guys are so careless about their intimacy?

In the pubs in my city, restrooms are often unisex and often with urinals without dividers. When we walk in, we can easily see the intimate parts of the guys that are using urinals. We even joke between girls about what we see. And guys seem to know that everybody can see their private parts, but seem to be relaxed and careless about that. When I see that, it makes me laugh, and I say to myself that I'm glad to be a girl and not to expose my private parts to strangers.

So, why guys seem not to care about that?

Why guys are so careless about their intimacy?
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