And since most men (and some women) don't understand this "Mind Altering Sex" effect, allow me to explain in scientific terms. When a woman has an orgasm, her brain also releases a hormone called oxytocin, in proportion to the degree of the orgasm. Oxytocin is in fact a mind altering substance which creates a pair bond effect with the person who caused the orgasm. Oxytocin effects last approximately 2 weeks, and are generally flushed during menstruation. Therefore, if you want to keep your woman enthralled, fuck her brains out at least once every two weeks and immediately after her period. Do this, and she will be yours for all time, or until someone else resets her oxytocin behind your back - at which point you need to reset it to yourself.
If your woman isn't interested in sex at the moment? Then get your testosterone going, and get near her, then put her in a position where she will produce her own as a reaction to yours - some manner of fight or flight response. Put her on the back of a motorcycle. Intimidate her. Wrestle with her. Hell, even start a good argument if you can stay focused on the goal. Whatever. Testosterone is the universal "horny" hormone, and its effects are literally ten times more powerful to women (as they have very little resistance to it). Simply being in the close presence of a man who is exuding a lot of it will often be enough to cause them to get horny, but it is always best to get them to produce their own. (This is one of the reasons why so many women are attracted to piece of crap guys... aka men who produce too much testosterone to be a benefit to society)
Once you have them horny, let the Mind Altering Sex begin, and you will OWN her ass.