The rooms increase "Films sold". The girls get more stamina in better rooms, so either films ARE exp for the girls
This is what I expected too in the beginning: that the amount of films sold is the experience that is gained by position. But I started doubting this when all positions upgraded by the same amount first time I tried them. Even though by the time I got to the last position I got a lot of stamina from the others already, so was making more films compared to when I started upgrading the girl.


Quote Originally Posted by Hornypony View Post
or the exp is increased too, but this fact is not written on the buy tag for the rooms.
This seems to be correct. The room bonus for exp is the same as for films sold but it is not mentioned on room tag.

When I was doing this test myself my three tests were:
1: Ice (173) in room 3: sold 819 films and upgraded position from 544/683 to 611/717 (611+683-544=750).
2: Ice (174) in room 3: next time she made 822 films and upgraded position from 611/717 to 644/752 (644+717-611=750).
So even though there were 3 more films, exp gained by position remained the same.
3: Sanshi in room 2: sold 518 films and upgraded position from 392/789 to 228/828 (228+789-392=625).
I also did a test for 1st room but didn't write it down, because it was already obvious how it behaves. Just got a base value of 500 from it and stopped testing.

The numbers would be in the right area. Currently waiting for Lola in room 1. She has two pos and with one I get a lvl of stamina with the other position not. And I have 218/563, so with the 500 mentionend, that would be a lvl up. Will check later the number of films sold and the new lvl up requirement.
If this theory is correct then she should have 155/- after completing the movie. Will wait for your results.