Outside of the Simon quest and some rare random events, yes all encounters are located in the pub. It will of course change as the game progresses and you should eventually see encounters almost anywhere you can imagine. It's all focused in the pub right now as it was basically the testbed to see how things moving forward should progress and to see what players want/expect.
You are right. Some areas/events can be controlled since I know what Sammy will be wearing but some places in the sandbox cannot be controlled so I will need to use some creative methods to show the encounter. Extreme closeups combined with the side facial expressions is one way to do them. Colours are easy to change but the major issue is the hair and makeup combinations (That's why there are no blowjobs in the pub currently). I have already done a fair amount of testing on sandbox events and once the next story chapter is done you should see a lot more events in the town appearing.
Getting caught in the bathroom is already there ;) It's just a fairly rare event. Other areas like changing in the park is planned to be done alongside a medium sized exhibition storyline I am planning.
Thank you for your feedback and I am glad you are enjoying the game.