I at one time worked with a hard core lesbian. She approached me and asked for my opinion. She had a friend who was visiting from Washington DC. She ended up having sex with her friend and wanted to know if she cheated on her girlfriend by having sex with her friend. The thing is she did not have normal sex with her friend. Her friend who was visiting is a Transsexual pre-op man to woman. So when she has sex with her friend, she fucked her transsexual friend in their ass with her strap on dildo. That is all they did. Would you call that cheating?