So I randomly get painless white patches on my inner cheeks...they come and go, I don't really have any markings in my mouth besides them, no pain, but what are they?
Why do you think these are sexually transmitted? It is probably something called leukoplakia. Common. https://www.webmd.com/oral-health/guide/dental-health-leukoplakia It's a reaction to chronic irritation of the mucus membrane. It's usually harmless but you can check it out with your dentist.