I need help with my girlfriend's sisters love life

do you like your girlfriend??? do you want to lose her come on get real a some common sense you do not cheat on your girlfriend with her lil sis you do not cheat at all!!!

GUYS LIKE THIS IS WHY I HATE GUYS!!! you are willing to cheat cause someone is hot no emotions no anything grow up!!!

First of all - you have a girlfriend, have some respect for her. Second of all - never have sex with someone because they are “hot”.

Get some cahones, act like a man and ignore her. You have no necessity to follow your every instinct.

ok, this is so mean the way you phrased it so I’m going to use all capitas from now on:

  what the f*ck! WUT IS THE MATTER WITH U. YOU HAVE A GIRLFRIEND you SICK LITTLE BOY. IT DOESN'T MATTER IF YUR GIRL'S SIS WANTS 2 have SEX WITH U.  LEAVE HER SISTER;S LOVE LIVE OUT OF IT, THAT'S NOT YUR BUSINESS AND NOT AN EXCUSE FOR WUT you R THINKING OF DOING. THAT WUD BE DISRESPECTFUL 2 HER AND YUR GIRL, USIN HER FOR SEX. 
  HOW OLD IS THE SIS ANYWAY? IT DOESN'T MATTER IF THE SIS IS ATTRACTIVE, you have A GIRLFRIEND, SO GET OVER YUR DAMN SELF. you CANT have IT BOTH WAYS. 
  WUT DO you MEAN "WUT DO I DO?" you DONT have SEX WITH HER you PERVERT! THIS WILL CAUSE PROBLEMS IN YUR GIRLFRIEND'S FAMILY, BELIEVE ME, THEY WILL FIND OUT. YUR GIRL WILL H8 HER SIS AND THIS MAY GO ON FOR A WHILE. have you EVEN HAS SEX WITH YUR GIRLFRIEND? IF you HAVEN'T, SHE WILL THINK THAT:
 1) IF SHE TOLD you NO, THAT you SETTLED FOR THE NEXT BEST, HER SIS
 2) IF IT DIDN'T COME UP YET, THAT you THINK THAT SHE ISN'T GOOD ENOUGH.

  ALSO, YUR TOO YOUNG, YUR 14, you want to have AN AFFAIR WITH YUR GIRL'S  SIS?! GET REAL, IF you LIVE IS AMERICA, THIS IS A JERRY SPRINGER MOMENT PEOPLE, IF you DONT, GOOGLE "JERRY SPRINGER" OR WATCH AND EPISODE ON YOU TUBE, CAUSE THIS IS WUT IT STARS OFF AS, PEOPLE LIKE you RUIN FAMILIES.

  THIS QUESTION ISN'T RIGHT. HOW DARE you ASK THE PEOPLE OF FUNADVICE IF you SHUD CHEAT ON YUR GIRLFRIEND OR NOT?! AND WITH HER SISTER! THIS IS NOT THE KIND OF ADVICE THAT WE GIV. you are A TRUE PIG AND you are THE KIND OF GUY THAT FATHERS WARN THEIR LITTLE GIRLS ABOUT. 
   you BETTER BELEIVE THAT IF YUR GIRL'S FATHER IS AROUND THAT HE WILL HUNT you DOWN AND BEAT YUR A$$. BE SERIOUS NOW. I BET you AREN'T EVEN WORTH ALL THIS DRAMA IF you are WILLING 2 DO THIS TO YUR girlfriend. 
 DO you have A BROTHER? HOW WUD you FEEL IF SHE DID THAT WITH HIM?

I HOPE THAT you GET ALL OF THE OFFENSE THAT THIS RESPONSE INTENED. I’M NOT USUALLY THIS MEAN, BUT YUR QUESTION CALLS FOR IT.