What I find really amazing about this thread is that essentially both sides of this argument have adopted the same standard. They've rallied around one imaginary player or the other, championed them, and they've adopted the stance that the important thing is the game. Both sides have essentially approached the problem in the exact same way, and the only thing that they disagree with is which of the imaginary players needs to be tarred and feathered and thrown out of the group for hurting the game. This is adopting the stance that the game is more important than people, or at the very least, that one friend is disposable and the other is not.
Well, first of all, I certainly have not "adopted the stance that the important thing is the game." I'm not proposing to throw people out of the group for hurting the game... the game isn't a person, it'll be fine. It's when your in-game actions are making your fellow players, who
are people, feel uncomfortable or unwelcome, and they tell you as much, and you
keep doing it and get all self-righteous into the bargain, that I as DM reach for the game-table equivalent of the banhammer.
Yes, it's theoretically possible to use "I'm uncomfortable with that" as a way to "hijack the group" as you put it. I've never seen it done, but I could conceive of it happening--someone comes into a hack-and-slash campaign and tries to guilt everyone into making it into an episode of Barney and Friends, or something like that.
However, we're not talking about that kind of general stuff. We're talking about the specific case of PC-on-PC romantic pursuit. Sexual relationships are fraught with real-life concerns, and unless inter-player romance is an explicit part of the social contract in your group (everyone knows and acknowledges that it's part of the game before they sit down to play), the desire of any player not to be involved in it* in-game should be respected.
It's not that there's anything wrong with introducing the idea, just like there's nothing wrong with asking somebody out on a date in real life**.
The problem is when you don't take no for an answer. Ask anyone who's dealt with an unwanted suitor how much fun
that is. If the player says, "I don't want to deal with your PC pursuing mine," the person initiating should respect that and back the hell off.
Go through friendships much?
If somebody is acting like a jerk and making things un-fun for other players, and they keep doing it after being asked to stop, they need to leave the game. I haven't said anything about ending friendships. Being friends does not mean putting up with obnoxious behavior, and if being called on obnoxious behavior causes somebody to end a friendship... well, that's up to them, not me. See
Geek Social Fallacies #1 and #2.
I've known people who are excellent friends in general, but sitting down to game with them is a bad, bad idea. Gaming just brings out the worst in some folks.
[size=-2]*Yes, having to say no all the time, or deal with extravagant gestures of affection, counts as being involved.
**Although I strongly endorse discussing it out of character first. It's bad form to spring something like that on another player unexpectedly in the middle of the game, where objecting to it means bringing the whole session to a screeching halt.[/size]