She comes home from a long day at work, then has to prepare food for the kids and spend quality time with them, then do stuff around the house, then prepare them for the next day… and then she's expected to be sexy, willing, and able for her man after all this.
Speaking of another man, having another person, real or imagined, is also a great sexual inhibitor for both men and women.
Another sexual inhibitor is when a man finds out about his woman's sexual history, and that's why smart women lie about that data.
A lack of respect is also a sexual inhibitor, and when women lose respect for their man, you can kiss the sex goodbye.
Sexual inhibitors are real, and both men and women experience them at some time, so don't sweat it.