As I am figuring it is rather hard to put any sexual traits in for a seductress as they would either require ooc consent of partners or force certain behaviours I thought maybe it could be the charm factor that a seductress has that could be a advantage. Some ideas being:
Natural discount:
The natural charm, and fear of mischief if upsetting a seductress, inspires clerks to give a seductress a X% discount on sales (X being whatever would be considered acceptable.
Minimized punishments:
It is hard to say what inspires it, whether it is the seductress charm or simply an acceptance of her mischievous ways but it seems whenever a seductress gets in trouble her punishment is far less severe then that another person might get for the same deed.
(oocly: if both parties consent this minimized punishment would often be a sexual favor replacing the more common punishment.)