I don't know Skyblue's inner thoughts or motivations here and can't really guess.
Maybe he was thinking if at some stage there were children, that they may find the word penis risque, shocking upsetting or whatever. Maybe one of his existing mortgage mbership were upset?
I dunno. Only he knows. But it is his board and he can make those decisions. If anyone on there wants to talk about penises, probably better choosing a different topic