The important thing is that you know that you have a rel=nofollow link-condom on when engaging in wild linkage orgies. This will save you a lot of trouble the morning after - no need to worry "did I go too far? Was that other site really clean? What will the wife say when I admit to linking with someone else?" The link-condom is good, but you have to be sure that you have it on.
So how do you see it without taking off the covers (viewing the code)? Just follow Matt's steps (requires Firefox). It's easy. It makes you wonder how you ever got along without it. It lets you see who else has a link-condom on. Who would have thought?