Be careful with this sort of thing; OnlyFans only issues refunds for content purchased after subscribing, never for the subscription itself. That said, ALWAYS ask for specifics when buying content from one of these hoes—for example:
Hoe: "$20 to unlock this 8 min oral vid"
You should ask something like this, depending on what you expect to see: "Is it a video of you performing oral sex on a man? Like, you with a penis in your mouth?" (I know it sounds silly, but you have to be very specific.)
If they say yes and you buy the video, but it turns out not to be what you asked about, then you can report it and request a refund; eight times out of ten, you’ll get your money back. And if they answer "no" regarding the specific content details you asked about, then you know not to buy it.
Although, always keep in mind that OnlyFans looks after its "creators" more than its customers. And my personal advice is: don't buy anything from Mia Khalifa—don't even subscribe—it's not worth it.