I was a little confused as to why the change since I feel as though I was doing very well on the Premphase. I have no idea why the change. In fact, I'd be interested in knowing why the change. Here again, I've reviewed everything we know in the book, but basically testosterone is the hormone of desire. Estrogen, exercise, and eating properly can also help your sex drive.
Exercise causes our happy endorphin hormones to increase and they are very helpful as well.
And giving up alcohol in large amounts helps, too. Frequency is helpful, not in increasing hormone levels but enabling the vagina to remain lubricated and more elastic. Sexual positions depend on preference and on medical problems. For example, a woman with osteoporosis may be more comfortable one way than another. You need to experiment to see what works best for you and your partner.