The sexiest was the apadravya I had- a straight bar stud thru the head of the cock. Most intense.
The PA is a good second best.
On women... multiple labia piercings, a clit piercing if they have a sizable enough clit, or a hood piercing is sexy as hell... Nipple piercings- especially when barely visible thru a blouse are to die for.
Altho I am not a big fan of overdone facial piercings... I do really love the look of the single ring thru the center of a full lower lip where the ring is tight to the lip.
And a series of graduated gauge ear rings is hot as hell... with the largest and heaviest ring in the lobe and each successive ring smaller and lighter going up the rear edge of the ear.
This is particularly hot when you discover that she has a similar arrangement of multiple rings in her labia.
In fact, I would say It is hottest when a visible facial piercing evokes a similar piercing in a more intimate location.
For example, when girls with a tongue stud, also have vertical studs in their nipples.
Or A small septum ring is wildly hot when a girl has the same size ring thru her clit or clit hood.
Those intimate with such women cannot even look at them without wild and lustful associations playing in their minds...