For those of you with Netflix Instant Watch, you might want to check out Wolf Cop. It's yet another B-grade werewolf movie, but there are some transformation/(fursuit)sex scenes in it that might be of interest. I was amused at the penis transformation scene about 30 minutes in, and there were a few genuinely amusing moments.
Which reminds me to warn you all that there's a rubber penis at one point, so be sure to avert your virgin eyes.