Why do wine glasses have stems?
First, by holding the stem and not the bowl, you don’t warm the glass and its contents. This is important for all wine, not just white. Wine should be served at a proper temperature and even red wine can be overly warmed by your hands.
Second, by holding the stem and not the bowl, you keep the glassware free of smudges. This allows you to clearly see the wine and keeps your glass attractive and clean.
It is also much easier to swirl a glass by the stem, but that is likely an ex-post rationale.
Regardless of the type of wine, you should enjoy it in proper stemware held by the stem.
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