In my opinion if you have a good reletionship with your sis. you should just convince her that you have no sex experience and shying about the other girls for being virgin etc.. find something to prove ur sis that you are hopeless and when she had no chance do your move gently or let her lead the way. wristscream Aug 05 2013 3:12pm FLAGI am a girl and my best friend is a guy.