Because it was a sea side resort?
The Romans did take vacations to the seaside. Rent a little villa. Take that cute little eight year old slave you have had your eye on along in case you got bored with the gladiators.
A decade or two ago I recall watching a Discovery channel documentary on Pompeii. Dusplayed were frescos depicting fair skin women being ravaged by negro men with very large appendages. I’m still confused by it to this day.