What does Yoshimura mean by "sugar" in chapter 92?

Question

On chapter 92, there's a conversation between Yoshimura and Roma inside Anteiku that goes like this:

Yoshimura: What do you have to be careful about in both "the coffee you served to ghouls" and 'prostitutes on street corner'?
Roma: ??
Yoshimura: "Sugar"
Roma: ...... what? (confused)

This joke went right over my head when I read this chapter. If someone could explain it to me that would be great.

Answer 1

As stated on Wikia, the original joke is about "serving coffee for ghouls" and "man on a (baseball) base". The original script goes like this:

「"喰種"へ淹れるコーヒー」とかけて「鈍足な出塁者」ととく――「トウルイは控えるように」。

^{Source (Japanese)}

Rough translation:

"Serving coffee for ghouls" and "slow-footed man on a (baseball) base"... is "to refrain from tourui".

Here, tourui is either 糖類 (saccharides; sweeteners) or 盗塁 (base stealing; steal; stolen base), which basically means:

• Not consuming sugar on coffee for ghouls
• Resist stealing a base for slow-footed man

Since this Japanese wordplay is almost impossible to be translated properly (and the joke itself is quite technical), I believe the translator changed it so that joke can be understood easier while trying to preserve the nuance for "sweetener/sugar" and "serving coffee for ghouls".

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... as for the meaning of "sugar" in the translated version, it probably means:

• Sugar, a prostitute that appears on The Crimson Petal and the White (or alternatively, a general/famous codename used by a prostitute)
• Sugar baby (Wikipedia)
• Brown sugar, or heroin

Answer 2

I believe the sugar is a reference to cocaine. If you look at pictures of crack cocaine, it kind of looks like an off color sugar