You might get hit on due to the status of being the only guy in the class but you will have to deal with their petty vendetta's, constant backstabbing, and gossip behind their backs.
God help you if they assume you are gay like the other guy and you reject their gossip; a fury of a women scorned is something you do not want to deal with when your the only guy. With so many girls there, you'll most likely be doing more talking than actual work as well so I hope you best of luck. You will need it when they get bored and treat you as an emotional tampon about "that time becky snubbed her at the bar Q_Q".