Why do you wear a cock ring?

Why wear a cock ring? For me there are a number of reasons:

1. I like the look.
2. I like the feel of having my cock and balls encircled.
3. It makes me have create larger, harder erections.
4. It intensifies my orgasms.

So, guys, why do you wear a cock ring? And girls, do you like your guy to wear one?