(Taste Buds) > Bitterness from a wine may linger because of location on tongue and less salvia pooling there to flush. Sweetness from a wine can pack a punch, again location, hence sweet wine served with smaller volume in port glasses
Port Wine is a Portuguese wine. It is produced from grapes grown and processed in the Douro region in Portugal. It is typically a sweet red wine, but also comes in dry, semi-dry and white varieties. It is often served as a dessert wine.