In the game Casino Inc., various conventions come to town, one of which is a fetishist convention, which changes some of the gamblers into ABs.
Also, in the Scrubs episode "My Bestfriend's Baby's Baby and My Baby's Baby", there's one full-on reference and one mention of a diaper wearer. The full-on reference is when Turk confronts Elliot about her running Carla's labour, and she says something like "Sorry, but I just love babies *so much*", to which Keith (her boyfriend) says "Sometimes she even makes me wear diapers". You used to be able to see it
here, but for some reason the video's not available. The diaper wearer mention is early on in the episode, at 0:39 in
this video.