The only problem I see with this is that it's not a direct translation of the JP text.

On its own, admittedly, I think it's actually quite funny. It's a 13+ rated game, after all, so I don't see the issue with this type of perverted humor.

There are certainly more graphic things in this game than this (such as lalafell courtesans) but this assertion that these this is inappropriate are exactly why we have Haurchefant being censored.
Please stop condoning censorship.
It leads to a worse game.

I agree that it should be changed, but not for the reason that the OP claims.