Re: parasite in city
I would think that kind of fetish would be incubation, but I suppose insect porn is closely related. One thing I like about insect porn is that the insects have thin legs and they wrap around the waist from the backside. And then you can get other cool things like moths/butterflies which add wings on the back, and that's hot.
Since we're also on the subject on enemies in games with grab moves I suppose I could add a couple more to the mix. I could also mention that for fights like Launch Octopus, that's what emulators are for. Infinite Health codes and Save States take your right to the action.

I should also say about Megaman X1 is that I like those fish as well, which also reappear in X5 (but that stage is auto-scrolling).
Super Metroid: Beetoms (those green bug things in Brinstar), Kraid, Metroids/Mocktroids.
Metroid Fusion basically has a boss in the shape of a condom that jumps on you, forces you into Morph Ball form, and sucks on you. Seriously.
King of the Dragons: Slimes (they wrap around your legs) and Mimics (they literally bite your ass and drain your life)
King of the Monsters 2 has a Metroid knock-off that's looks more like a jellyfish.
Zelda: Skyward Sword feels like half its roster has grab moves. But one parasite enemy shows up in the desert areas that looks like like a scorpion and several can jump on you at once.
There's tons of other games out there, but some franchises which always seem to have grabbing enemies in each game are Metroid, MegaMan, and Zelda.