
My wife and I often make "pair characters" as they've been labeled here simply to offer each other that easy IC out when the stalkers arrive. Granted, I've yet to run into any stalkers personally on FFXIV, but my wife apparently has made the hottest character alive as she quite often gets stopped by someone seeking out some sort of romantic RP. I dare say it's gotten to the point of at least once a week.
My wife's character is always fully clothed, in a robe most of the time in fact... so it's not like the whole "she's asking for it" argument applies here. She's not walking around in the coliseum gear set, in other words, showing every bit of skin possible.
 And she's always open to random RP, so if someone stops her, she will actually stand/sit there and RP with them. Then it gets to the point of (paraphrasing) "So, are you single?" To which her character's response is "I'm actually married." The other RPer usually gives an "Oh..." and then awkward silence follows.
I, generally, have no problem with my wife RPing romantically with other people. We've just personally had too many experiences similar to the OP where the romance becomes a "real" thing for the other person and we have to call it off.
That being said, my wife and I do have other characters that are not romantically involved and/or have very open relationships.
My wife's character is always fully clothed, in a robe most of the time in fact... so it's not like the whole "she's asking for it" argument applies here. She's not walking around in the coliseum gear set, in other words, showing every bit of skin possible.

I, generally, have no problem with my wife RPing romantically with other people. We've just personally had too many experiences similar to the OP where the romance becomes a "real" thing for the other person and we have to call it off.
That being said, my wife and I do have other characters that are not romantically involved and/or have very open relationships.
Raandal Bennett (Deceased)