Alternatively you can do what works with every girl, sexually harass them with Rogue (or any other girl who likes you) by asking them to do some kind of threesome action like make out or dance together... then start banging the girl who you are harassing them with until they get horny and either start masturbating or decide to join in.
I never buy them gifts or bother doing anything else to get them to like my character. I just keep making Rogue deep throat or take it up the ass in front of them. In my latest play through I kept on banging Rogue in front of Emma, then banged Emma in front of Kitty, then banged Kitty in front of Laura. You can do it in essentially any order. I find this is the more fun and productive way of getting them to like you.
