How To Please Your Lover

By sharing yourself and trusting to him. There is no real guide to how!? and what!? in sex as much as there is none about life. The first step is feeling the magic. Without it there is no pleasure only the need of the urge that something has to be done. Guys in general like to be in control. You can please him in two ways here. Confront him and play hard to get to certain point since to many guys this game of hard to get is great sexual turn on; or make him believe he is in control. No matter what watch his reaction. 
If You are together for quite some time and You know his reactions in general try something new, something different but never do it to hard or to fast. Most of the guys I know enjoy the routine in their sex life and You can't break to fast. Go slow with Your wishes and fantasies. Remember they need to feel they have control over Your sex play.
Being comfortable, relaxed, and stimulated properly is one of the key issues. Knowing Your partners likes and wishes as well as being able to share Your own is a good head start. Talk about the positions, foreplay stimulations, even problems You may have. The more intimate You are with Your partner, the closer to the road of better sex You are
The best way to keep a man happy is to fulfill his fantasies. There is nothing wrong to have one so why not playing them!? Do a striptease; wear a doctors outfit; have sex in a boat or in a car; give hi that blowjob when he needs it and be sure he'll triple his pleasure on to You.