We all need to write characters who are different from us. Even those who are the opposite sex. It takes a good stretch of the imagination to write convincing characters who are intrinsically the opposite of what we are familiar with. Try this little exercise and see what happens.
You wake up one day to find yourself in a new body—the opposite sex of who you really are. Your body is completely foreign to you. What does it take to get used to this new body? What habits are hardest to break? Write about the for 10 minutes.
How did you get used to your new body? Or did you?