According to jaw muscle moderate pain testing, it turns out that females have varying responses to pain depending on the Estrogen/Progesterone levels (ie..."time of the menstrual month), and the mu-opioid neurotransmitter system response to those levels. When the hormone levels are the lowest, the females were most vulnerable to pain and negative emotions/thoughts were the highest. The opposite was true when the hormones were at their highest levels. The mu-opioid receptors demonstrated on PET scanning were at their highest levels when the hormones were as well. Also, nocioception (the perception of pain) appears to be dependent on rates of dopamine clearance.
Doc....I bet you could make sex sound boring.....
Ah, but that was cleaned up considerably for the forums... Doc's lady friend tells me that he gets right down and dirty when in private.
Ooooh, I love cats, but I can barely finish one
That reminds me of the Schweppes ad from some years back, and the lion denying that he disliked elephants: "I like elephants alright... I just don't think I could eat a whole one."
I normally don't like ads and pay them no mind, but that one got my attention/tickled my funny bone. 
