So I was having breakfast with my housemates and friends and the conversation somehow turned to some species of mice in which prior to mating the female beats the male up so he is barely alive, mates, and then leaves the male to die. All well and good, weird, but fine. Then one of the women with us makes the comment "that is the way she has sex with guys". Whilst said as a joke, I know if I, as a male, said that there would have been no laughs and it would have just been an awkward silence.

What things have you heard said by your friends and family, which, if said by the opposite sex would be considered completely taboo?