Excellent game Perverteer, the dialogue and descriptions are particularly good, but..try as I might the options don't seem to let you get to hump Rachel, I've tried it by only giving attention to her and her friends, nothing, and even after several playthroughs haven't triggered any cinema invite by her as you suggest.
For those playing for the first time, I'd strongly suggest not having the middle sister (I called her 'Tits') fall in love with you, but go the master-slave route, it's way more enjoyable.
My personal name choices for added fun were: Protagonist - 'Big Dick',
Youngest Sister - 'Rachel' (kept), Middle Sister - 'Tits', Eldest Sister - 'Kameltoe', Mother -'Slutty'
PrE VIII