So me and my girl have been experiencing this, not just once in a while... but literally it's been like five times in a row now lol. The sex with her is amazing and she says the same with me, and no, shes not faking it when we both cum together. I'm just curious as to how common it is to both reach orgasm at the exact same time. I've read it helps when you two are in sync with each other, which we are, and extremely comfortable with each other. She's like my best friend.