Ha, I like anniebrooke's advice. The more you do for her outside the bedroom, the more she may appreciate you in the bedroom. Very true for me. And if you do want to please her, ask her at the time what she wants but do not grill her or act like her answer of 'you are doing fine' isn't good enough or it puts pressure on her to come up with a better answer that might not be sincere. good luck and relax and enjoy yourself and her.
If you have kids, the fastest way to get your wife excited about you is to take care of them, entertain them and play with them, feed them, clean them up and put them to bed. She will be so thrilled with you. You probably think I'm kidding, but sexual excitement with a husband is not so much about his technique, it comes from what she has been thinking all day about him, and if he delights her with attention to boring tasks that usually fall only on her, he will find a warm reception in the bedroom. Same thing with taking a brief vacation [without children]; it is just so nice to have time to play with one's spouse instead of just the daily grind, that warm feelings come naturally to the fore. You are treating rather mechanically a process that is not mechanical.