Well Well... don't we see this scenerio ever so often? Look around
you and you might find many of such examples, don't you? 
I guess it all boils down to respect.. Self respect and also respect for
your partner.
ask yourself the question: how would you feel if your gf is being
pillioned around/your bf pillioning other girls around? 
Personally.... I guess I shan't state the 24 inhumane stages I will
put my partner through if that ever happens .
I have seen girls who are attached still pillion on other guys'
bike, jus because the bike is bigger and faster than their own
boyfriends' bikes, and guys with big bikes use their machines as a
bait to attract girls to them. Come on, we know how practical and
xian shi the world is, don't we?
Maybe people can say: we are just friends wad... nothing wrong with
that, well, the definition of just friends? Hahaa.. hard to say
huh... and how much can you trust the 'friend' of your girlfriend?
I've seen examples of girls being pillion around by guys who they
claimed as their 'good friends', 'friends only', when they
themselves know that the guys who pillion them are actually fond of
them. Well if thats the case, aren't they tryin to lead the guy on?
And which guy with a sound mind would allow his girlfriend to go
out ever so often with a guy who is interested in the girlfriend?
Well either the guy is really confident of himself , or that he really trusts his girlfriend 
or the other guy 
that much. All I can say is.. hahaha fool, good
luck!
But i assume in some scenerios, some guys just take their gf as
some kind of goddess and ever so afraid that they might lose them
if they don't grant them any freedom, haha whats the difference
between a dog and the bf? The difference is.. the dog has more respect and
attention from the gf! 
As much as the girlfriend is a bitch, the other guy is an
asshole, the bf is also a fool to begin with to allow such things
to happen, isn't it.
I have seen this funny incident, which nearly made me burst out
laughing... it happened last year, when this couple went out with a
big group, and the day before, the gf was pillioned by this guy who
rides a big bike and interested in her. There they are sitting
there, pretending they don't know each other well, and just
acquaintances, when everyone else knew this girl is always
pillioned out by someone else.. I guess everyone there must have
had laughed at the bf for being such a backboneless wimp to allow
such things to happen... Hey man, if this happened to you before, I would
want to tell you: I wished I had laughed in your face! 
If a girl really has the self respect 
, I don't think she would want others to have the wrong
impression of her, and whats the point of misleading someone else
when you yourself have a boyfriend and know that the person is
interested in you has totally no chance? Because he has the bike to
give you the thrill ? The attention you get? To take the person for some fool
and make use of him? To take him for granted? 
Well as for the 'asshole' in the picture, he is quite a fool too
right? But sometimes I guess the girl played a part in giving the
wrong impression too.. isn't it? so he should wake up his idea and leave that
b*tch for someone else!
As for the bf... if he is in the dark, oh man, what can I say,
tough luck! and hopefully someone will let him know soon... but if
he allows it.. muahahahaha I would be laughing hard when
one day he becomes the laughing stock without realising it. What
can I say... he is stupid to begin with. His gf doesn't give him
the respect, and he take it because of the fear of losing.
Pathetic!
End of the day... every element plays a part.. and i tink in this
case, you need a B*TCH as the main catalyst... the manipulative
little witch, with a couple of fools and assholes to go with it to
complete the picture
whoever it is...
good luck!
