If your SO is your fiance, husband or a permanent domestic partner, they might take you SO's potential acceptance into consideration. If your SO is a boyfriend, they might not look favorably upon your request.
I had 2 friends who applied to GWU; they were engaged; woman was accepted, man was wait-listed(two different departments). Woman wrote to both adcoms and said, "We are engaged and will not live in separate cities; if you do not accept him, I will not attend." Adcom ended up accepting the man. Although it worked, it was probably a risky move.
I'm not exactly sure where I'm going with this, but I hope it helps.