I used general sex skill in prostiture class btw. Even if we'll have all pictures in all packs, I think it's still better to use it instead of 3 new skills (tits, hands, foots).
Also, I'm not sure what to do with advertising. Initially, in the very beginning of the project, we wanted to hire unemployed (by MC at least) city girls to do it as a part time job. Another option is to make a full job for it.