Henry, you've started another interesting thread. It's striking me as rather funny how I've looked at this site for months and months have just now become aware or the words Relationships, Discrimination, and Jealousy. Interesting. I've been through the jealousy thing and I think it is sort of like a virus, in that once you've had it, and if it doesn't kill you then you're probably immune for the rest of your life.
Then there's my friend who has a huge cock. He's a friend with benefits. But let me tell you if he didn't have bad luck he'd have no luck at all. Sometimes I feel sorry for the guy.
I think LPSG should consider adding Competition to the heading of this category. (Of course I know this isn't my call.)