I don't know if this has been mentioned, but I don't recall seeing anything about it, so here we go.
Maybe it's just me, but it seems like some of those girl packs don't work.
Knowing that it didn't come with any, I started slowly, just to see what would happen. I started without any girl packs, just to see what would happen. (Not much, but then, I didn't really expect it to work.) Then, I shut the game down and started adding some of the random girls. I started with the Bunny Girl, and that's when things went wrong. I went to the slave market and the game froze. After it stopped responding to the system, I had to shut it down, forcefully. I thought, perhaps it needs a few more girl types, so I threw in a few more of the random girls. The game would work, but I got an army of girls in china dresses and girls with girls with horns (Kirin). No bunny, cat or slime girls. (Apparently, I'd forgotten to add the waitress. Tested it, later. That one does work, as well.) Out of curiosity, I removed the China Dress and Kirin packs, again (the ones I knew were working), and the game started locking up, again, as soon as I'd enter the slave market or take a walk.
I imagine most people are using multiple packs, so they may not be noticing that a few of them aren't firing correctly ... or maybe it's something on my end. Thought I'd mention it, though.
If it matters, I was using the 800x600 version.