The female like hypothalami should be inhibitory not provocatory.
That's funny.
More than one issue there. One is that the homosexual lifestyle, especially the one you bring up, is a deviant lifestyle no matter what the PC movements try to claim. There are many psychological problems in members of that community - drug addictions, abuse behaviors, depressions, etc. Unaddressed, these lead to greater aberrant behaviors like the startling levels of promiscuity. It's as if the circuitry of sexual behavior and emotional feedback is broken so the deeper satisfaction of a committed, mature sexual relationship becomes incredibly difficult to attain if at all possible. So, the behaviors get more and more frantic and deviant in an effort to accomplish an impossible goal. The psychological problems worsen and the cycle of deviancy becomes more extreme.
The second issue of the "inhibitory" female headaches you bring up is a social issue, if anything. American culture spent so long in the sex as a woman's "unpleasant duty" mode that many women, and men, have really messed up conceptions of sex in a relationship. The pathways in other species, other primates, are involved stimulatory behaviors and the 'not tonight, I have a headache' seems to be an almost exclusive American or English/American phenomenon.