.
The new engine 4.0 will be able to handle (very) large environments.
But to get close to the GTA we also would need to have about 500 extra modellers

.
Because that is not at all realistic given our small budget, we are designing the engine in such a way that new add-ons can be made by modding.
The university environment in 4.0 will contain several buildings like a school building, a gym etc...
But if a modder e.g. adds a fitness club it can be added to the same scene by simply adding a pack to the pack directory.
The terrain of the world will be very large, so there are lots of open spots for mods to be added.
This way the environment can be expanded.
I do think for an erotic game the scenes do not have to as large as in GTA.
But the feeling of an open world with a lot of girls to "explore" is certainly the way to go.