i've had my character icly decline any possibility of their becoming a couple, actually. at this point, if i had my character stop to tell off theirs for throwing themselves at him whenever they did it, i'd pretty much have to tag that scenario out during every single one of our threads and i'd never get to the plot side of things (which is pretty much the only reason i tag them to begin with).

ignoring their shippy cues gets the job done. it doesn't always work, seeing how their character has on one occasion gone as far as starting to undress before mine, but most of the time, it gets the job done.