Jeremy974,
Yes, you can. It is
possible, but not very likely. You are more likely to catch something from what you are doing while your bare ass is in contact with the seat than just the ass-to-seat contact. Also are you just sittting there or are you actively rubbing your skin over the surface of the seat?
Most pathogens need moisture, heat and food to live. And most don't survive long away from their host. That and your skin is your body's first defense to most contact-borne germs. These factors help keep the risk level low.
Crabs would be the most likely STD you could catch from a theatre seat, especially if it is cloth-covered. But crabs don't do well away from a human host. So the probability of it happening is remote. You'd have to take a carrier's place within a small time frame of him vacating the seat for transmission to occur. How long is the timeframe? Can't answer that quantitatively.
Following the above thread, if you sit in something warm and wet, your chances are greater than if you sit on something cold and dry. Again the risk is low, but real all the same.
If you are going to worry about your personal health as it relates to your visits to theatres, worry first about the cleanliness of your sexual partner. Worry about the consequences of your exposure to second-hand smoke second. And then worry about your exposure to disease-carrying pathogens and STD's lingering on the furniture, tokens, and bathroom fixures in the place.
(and fourth, worry about your state of mental health if you find yourself spending all your days and nights sitting naked in an ABS or theatre)
