I'm sorry, I didn't mean to offend you and I wasn't being flip. That question is asked on a very regular basis and the answer isn't simple.
What you have to basically understand is that, despite all appearances, female libido is FAR more complicated than male libido. I saw an interesting show about human sexuality not too long ago that really summed it up nicely:
Male sexuality is essentially all mechanical. You could (essentially) cut a guys head off and he'd still be able to perform sexually.
With a woman it's virtually the reverse. Very little mechanics, virtually ALL of it mental. When a woman doesn't want to have sex you have to look at EVERY potential psychological reason, every potential stressor: In other words, how does she feel about herself, her environment, her significant other, her job. Is she sleeping well? Does she feel pretty, does she feel good about her body? Do you make her feel good about her body? Does she feel like she's being romanced? How do YOU look? How are YOU treating her ...
Let's assume EVERYTHING in her life is absolutely perfect, THEN you move onto the physical possibilities: Is she perimenopausal? Is she post menopausal? (either surgically or naturally, same difference). Is she on any medications, either OTC or prescription, in particular medications for insomnia, depression and birth control. How is her health in general? Is she suffering from any type of health problem, has she recently overcome any health challenges?
After all of those issues have been looked at and any potential problems eliminated, THEN you go to endocrinology, and this is the really tricky bit. It's very, very, very easy to foul up a woman's endocrine system when you're trying to dial in something like libido. You need a doctor who understands what the hell they're doing and what they're looking at. You can't just slap 10 mg packs of androgel willy nilly on a woman and expect her to fuck your brains out (I have heard of doctors prescribing this and much more to women and I have heard of some very unhappy results). You MIGHT get a horny broad, but you'll definitely get masculizing side effects and eventually she's going to reach an overbalance of too much of something and not enough of something else and then she's going to be even more screwed up than she was to begin with. Endocrine manipulation has to be continually monitored (this is true for either men or women on HRT, my husband is on HRT and has his blood drawn like clockwork). If she's skittish about dealing with doctors forget it.
And do bear in mind, if you're on juice ain't NO WAY her desire is going to keep up with your desire.
Anyway, the threads below (if you're interested) are some of the more informative and should get you both started. The most important thing is this should be something both of you should be addressing. If it's only something you're researching and she leaving it up to you, that tells you something right there. She needs to be honest about what she's feeling and why she's feeling it (or not) to figure out what she ISN'T feeling, so to speak.
http://www.elitefitness.com/forum/w...ing-training/women-libido-problem-303835.html
http://www.elitefitness.com/forum/w...ning/sex-drive-women-mods-experts-259040.html
http://www.elitefitness.com/forum/w...ou-all-recommend-low-libido-women-493917.html
http://www.elitefitness.com/forum/w...ng-training/best-way-boost-libido-378333.html
http://www.elitefitness.com/forum/w...abolic-androgenic-steroids-libido-373333.html
http://www.elitefitness.com/forum/w.../progesterone-libido-hrt-question-363542.html
http://www.elitefitness.com/forum/w...building-training/steroids-libido-359962.html
http://www.elitefitness.com/forum/w...-training/libido-enhancer-females-317984.html
http://www.elitefitness.com/forum/w...uilding-training/low-libido-woman-142577.html
http://www.elitefitness.com/forum/w...raining/anavar-sex-drive-12160.html#post93042