Well, I haven't, but if you've noticed my tag, my college roommate certainly did.
Yes, there really were 17 of them, and no, none of them knew about the others, although she never led any of them to believe she was dating them exclusively.
Three of them were named "Mike" and two were named "Dave."
That made for loads of fun when one would call, and of course she was never there, because she was out with one of them, and they would just say, "Tell her Mike called," and I dared not ask, "Which one?" and then when I gave her the message, she didn't know who to call back.
She often had a lunch date with one and a dinner date with another. She would come in and shower and change clothes between dates so one didn't smell the other's cologne on her clothes.
I was in awe of her social prowess. I have no idea how she juggled that many, plus college courses, but she did.