Many factors such as: personality, looks, intelligence, money etc.
Breasts
you know when a girl is interested in girls by the way she talks and acts. and by the way she treats the guys. if she pushes away the guys is cause shes interested in girls, you might sometimes find them staring at others girls(checking them out)
A girl smiling at me.
Guys think about girls quite often if they are interested in them. Guys mainly think about the physical aspect of women.
the guys are interested in you and not her because shes probably doing too much for their liking.
Depends on the girl,maturaty level, and personality.. As a girl, i would be disgusted.. Haha
Girls that are ignoring guys they are not interested in think it is more polite to ignore them than to have to explain they are not interested in them. They would rather not hurt the feelings of the guy and by ignoring them, the girl hopes the guy will not speak to them.
It doesn't necessarily mean he is attracted or interested in her but she is seemingly interested in him.
act nice and flirt
Maybe its because they want to know you.
maybe.
If she arouses him, and makes him have an orgasm then yes she can.