Re: sex 3 times a month??
i agree with conner but i also think you could make some other suggestions other than maybe there is something medically wrong. that would offend me too!
first and foremost, ask her if she is happy with the way your sex life is. i know that there is nothing medically wrong with me, i just don't really feel into it all that much and if i feel forced then i end up being emotionally wrecked. there are a number of reasons why she might not be into sex. COULD be medical, could be hormones, could be nothing at all. sometimes i can't think of one good reason why i don't want to have sex, i just don't. and i am in a very loving relationship like you are.
you have to be patient and not push her.
one thing i tried that is helping me is a diet change. i was amazed at learning about what certain foods can do to your emotions and your libido. i am not staying away from sugar, caffeine, and starchy carbs. eating more fruit and veggie, natural foods, whole grains. eating "good" fats and no processed food. if she is open to it try getting a book called "the orgasmic diet". you can read all about it on this forum, that's where i learned about it. it's the post at the top with over 400 replies. i really like it.
good luck.