Getting married at all in TSM has some routing issues which they never fixed. I don't recall this quest (I don't think I played it, or it never came up) but then I don't have P&N in my game. And don't have Origin to play it. Way back a problem occured with getting married at all in the game ( the bride or groom would not show up or not on time or whatever and routing issues) long before the EP came out, so it's one of those things they never got around to fixing. Since then (years ago) I make sure to hold my weddings outdoors where there is more space and not too far away from where others can attend.
ETA: No it has nothing to do with the gender of the Sims.