I was playing in a Shadowrun adventure where one of the other
players, Amy, made a “Face” character. I forget the character’s
name, but she was a disguise expert/martial artist with a boat
load of social skills. Her forte was to use her charms to gain
access to “employees only” and other restricted areas.  During
one part of the adventure, she attempted to charm her way past a
troll bouncer in a nightclub. When asked what the penalty was
for trying to seduce a troll, the GM told her not to bother. In
his mind, a troll simply wouldn’t find an elf attractive and
refused to give her even a minimal chance of success.  Needless
to say, play stopped as an argument erupted at the table. Amy
protested that the GM just nerfed her skill set 25% of the time
(it may have been 50%; I don’t recall the GM’s stance on orks).
She asked why he didn’t tell her this when she made the
character and the GM responded by asking what made her think
that a troll would find an elf attractive? After a few minutes
of discussion, we bent