You could simply say that Shin doesn't know what love is. That's why it's so easy for him to hit on every girl in the rpg (at least he's thorough *gg*), even though he was supposed to love his friend Emi/Ami.
And hitting on the girls in the room isn't so bad. They could simply beat his ass for one thing. And he can't simply write them into his bed like he did with Sa-chan *gg*
Plus, if you play a girl here, it seems getting hit on is something you have to be prepared for.
"For Feanor was made the mightiest in all parts of body and mind, in valour, in endurance, in beauty, in understanding, in skill, in strength and subtlety alike, of all the Children of Illuvatar, and a bright flame was in him"