My first kinky lover gave herself away by getting turned on when I held her down when we kissed, and was over the moon when I grabbed her and tied her down for sex. But, one time when I woke up horny and started to shove her legs apart, she woke up fighting and nearly injured me before she was awake enough to know where she was.

She'd hung out with bikers and had to defend herself before. If I had been really trying to rape her, I'd probably have had to go looking for my balls. A memorable lesson on the difference between fantasy and reality.