This happened to me once in Thailand, which is a bit cliche but it happened...
I'd seen this girl on some Thai equivalent of Vivastreet (red flag #1) as she looked hot and was pretty reasonable. Anyway she came to my hotel later that night. In person she was actually good looking but when she spoke her voice was weird, not manly, just off (red flag #2). She said her Mum was Korean, I was like okay then. Asked for the money pretty soon after she arrived (red flag #3) then when she was getting ready, nipped to the toilet for a very brief amount of time (red flag #4), probably to lube up down there.
When we're getting started she then turns the light off (red flag #5) then I start to finger her and fuckin alarm bells go off...
Felt completely wrong, like really shallow. It was like someone had just drilled a whole down there. I don't know if this surgeon did a duff job... but I think really the only person who wouldn't notice would be someone who has never fingered a woman before. It was clearly not natural.
Jumped the fuck up, said you are definitely not a lady mate, and get out of here. She said some ridiculous shit about just having a baby (?).
The receptionist phoned up in a panic, I reckon she thought I'd just been robbed as the girl left so soon. "Everything okay sir? Your lady?" "That was not a lady!"
Two lessons here.. trust your instincts and don't book from dodgy websites.
Reckon the hotel staff probably had quite a good laugh that night.