I wouldn't say aroused, but definitely kind of uncomfortable sometimes. I'm the youngest of my brothers, so my mom still calls me the baby pretty often, and after my girlfriend saw an email from my mom that said "baby boy" she used the nickname for a week. She had no idea about my lifestyle choices at the time. She does now though, and we're married!
Also, I teach English in Japan, and kids seem to find diapers generally hilarious whenever they are in kids picture books or things like that. Last week, a girl was reading from an English phrasebook at the beginning of the lesson and she just blurted out, "Paul-sensei, let's change your diaper!" ....I was like "What?!....oh, what a strange thing to say." Needless to say it was a bit of a shock.