When I was in college, I dated one of two identical twins. A lot of people gave me s*** about it.
Friend: “Do you have threesomes?”
Me: “No! That’s incest, eww!”
Friend: “Well, how do you tell them apart?”
Me: “That’s quite easy: My boyfriend had a distinct, and very cute, pattern of freckles across the bridge of his nose, and his sister is cisgender.”