I am going to be your friend for Material/Financial Gain
I am going to be your friend in order to increase my social status.
There are a 1000 reasons for someone of the same sex to be a false friend
I am going to be your friend because I want a relationship with you...
So there are 1001 reasons for someone of the opposite sex to be a false friend.
Is it possible for a rich person to be best friends with someone who is poor?
Is it possible for a Social pariah to be best friends with the life of the party?
Every friendship comes with emotional risk and potential manipulation...
"I am going to be your friend because I like you and want to make your life better". then you're onto a winner whether male, female, rich, poor, whatever
Summary: Yes They Can!