xokathy, it's all in fun, and basically when someone is your "date" you dance with them for at least one dance and if you don't want to dance more because you are dating someone, then don't
Most of the time we don't stick with our "dates" anyhow. And occasionally, there will be the boyfriend who gets upset about it, and sometimes that girl won't come or won't pick a tie, but it normally isnt a problem.