Can a Christian operate a heterosexual dating service?

Apparently not.  To get a sense of why forcing EHarmony to include same-sex couples in its online dating services is detrimental to the common good, you can check out this paper.  Better yet, it's never too early to begin lining up at your local bookstore for the Harry Potter-type atmosphere that will surely accompany the publication of Conscience and the Common Good: Reclaiming the Space Between Person and State (Cambridge Univ. Press, forthcoming Sept. 2009).