Beyonce Knowles keeps her rapper lover JAY-Z keen by whipping out a special super-sexy dress whenever he becomes complacent. The curvy R+B beauty insists every woman needs to step up her sexiness sometimes to remind her man why he fell for her. And she is so convinced by the fail-safe technique, she has even written a song about her favourite "freakum dress" on her new album B'DAY. She says, "Sometimes a woman feels like she needs to remind her man why they are in love with her or fancied her in the first place. "All women have that freakum dress at the back of their wardrobe and they can just put it on and it will remind them."