I was going to say, originally, that, if interpreted literally, it doesn't matter how hot you find the characters, getting raped means the situation is inherently undesirable to you and that wanting to be raped is oxymoronic. However, I just checked the definition of "rape" and, as it turns out, it just means sex without consent, meaning the characters intent on raping you will try to force themselves upon you regardless of what you say or do. Whether or not the situation is pleasurable to you is secondary. As such, since most of you freaks probably want this to happen to you, the real challenge becomes choosing three characters which you're simultaneously the least attracted to & the most incapable of preventing your rape.
So, anyways, I choose Averi, Blackchan, & Diane.