sweetplymate and Curtis both bring up a valid point.
It could be time for a physical or a visit to an OBGYN.

Here's a quick list of things to think about:

1. Your sleep schedule - has it changed?
2. Menstrual cycle? Is it on schedule? Are you using birth control pills?
Have you changed prescription recently? Changed other methods? IDU, etc.
3. Iron in your blood? As in are you enimic?
4. Did you change your vitamins, herbs, etc - add any, take any away?
5. Your stress level - Are you under pressure from work, family, etc.
Are you putting too much pressure on yourself?
6. Is your body temperature running hotter or colder than usual?
7. Going to sound weird - but are you getting enough sunlight
or exercise?
8. Have you gained or lost more than ten pounds in the last few months?
9. Do you give yourself enough transition time between work and "sex play"?
You know, like alone time in the bubble bath with your favorite naughty book/zine, etc?

Meanwhile, enjoy the movie and eliminate the guilt.
:cuddle:
Happy cuddling that leads to other fun things.