A couple should be able to tell each other in a comfortable manner what turns each other on, try romantically to ask her that you would like to see her with one on one night, in a descrete way tat you would like to try something new to entice her. Do not start at night work at it since the morning, talking sweet pampering he, and relieving her from some of her daily stress, being very attentive to her lure her into wanting and feeling to say yes. She's probably overwhelmed with other obligations in the relationship and lost the strive herself, turn her back on. Men get turned on to relax and woman need to be relaxed to get turned on