Instead of trying to talk her into it... get her to lay down, without talking about sex. Start rubbing here back, then after a bit go get some baby powder and tell her to take her shirt off. Keep working it until you have all of her clothes off and by then she should be in the mood. Make it about her, not about you...

smiling.......works on me.........

Hold her and spend time with her Cuddle while watching a movie share a blanket and take a walk. The more you put your body around hers without expecting sex the more she will want it.

^what this guy said If you're just doing nice things or spending time close to her because you want sex, its not gonna help. Spend time with her without asking or expecting her to put out.