I don't know if it's the only thing that needs to be done, but adding some more to the story, background, goals, etc. is something that definitely needs to be done. which I've pointed out in another topic (and a lot of this is probably going to be the same). I mean having goals would also make the game harder, just because you would have to plan for them, and if they are exicuted right you'll never have impossible missions, or ones that take half the game (for non/low level importance missions). and having these goals doesn't mean a person couldn't just play it for the images, they could and can just ignore the goals. just as they can now, I don't think that should change, just the variety should be expanded upon, and something put into place to increase the difficaulty as the game progresses. personally the game probably has enough jobs and stuff like that (though I would still like to have room/building decors, but that's just me), the thing is they need to be flushed out, given more reason to preform them (hey... job related goals, good for late game). like advertising could be taken to it's own category (but that's probably a little far off), or each category could have advertizing, to increase the benifites gained from using it (girls on the street to attract johns to the brothel, posters to attract customers to the bar, and slides cut from the movies to advertise for them, and even increase the profit, or even create magazines from them). if it's ever possible for girls to approach us for jobs, this could also effect what jobs they like, or how much they like a job off the bat, or when/if some girls will come to us.
actually that is another thing that would increase difficulty, and flush things out, (and make things funner, IMO), is to add more ways to get girls. like having girls you can only get from pregnancy (and then you can have girls that are only avalible as your kids, from preg omly with the your daughter trait), or from approaching you, (and as others have said) different slave markets, rewards from the harder goals/quests. but I think I became side tracked. .
some ideas for
simple goals:
get __ girls pregnant (with another get __ girls pregnant with your kid, or inseminated)
make __ movies,
have ___ girls on __ job
have __ many girls (in addition to the get __ many girls we already have)
acquire __ properties
have __ gold
harder goals:
add a time limit to the above goals
buy __ rooms (multiplies of 5, needs to be able to detect if you have, or can get a brothel with the ability to buy more rooms)
earn __ in a turn/week
make __ girls hate you less/love you more, hate/love __ job less/more
hard goals:
complete __ goals (if you can have more then one goal at a time)
acquire __ of __ item (difficulty determined by the price of the item, store bought only)
have __ girls with all/__ stat(s) over __
cause __ girls to gain (a)/__ trait (keep track and over all, not after given this goal)
complete __ hard/harder goals
winning/static goals:
buy a brothel
own all brothels
defeat all rivals
completely upgrade all/a brothel(s)