It is not 'forced arousal'. The vagina will naturally lubricate as a defense mechanism against tearing. Also, during a rape the adrenaline surge can make a woman climax more quickly and easily than normal. This is what I think really does a woman's head in, particularly if there was no violence involved such as with 'date rape'. The fact that she experiences pleasure can cause her to start second guessing herself and wondering things such as, 'did I in some way ask for it' etc. A friend of mine was anally raped and that is very different as it is very painful. It is much easier psychologically to turn pain into anger than it is to turn pleasure into anger. The fact that a woman may have an orgasm during rape also leads to idiots such as that Missouri congressman making fatuous comments about what constitutes a 'real rape' thus attempting to justify what is in fact a violation.