Venus

1. Have you tried to bend the bars as a gorilla?
2. You need a little more energy...
3. ...like you might get from a sugar rush...
4. ...from eating the chocolate you were given in your cell!
5. Before the mad scientist straps you down to the slab, give the chocolate to one of the gorillas, or just put it in the cage.
6. Wait until the mad scientist transfers you to the body of the gorilla and leaves the room. (You can facilitate his leaving by getting erotic with your mate.) Now, eat the chocolate, bend the bars, and leave the cage with the rubber hose.
7. You still need to get back into your own body, of course. How did the mad scientist cause the transfer?
8. The red power switch, of course! Throw the switch and you'll be back in your own body.
9. But don't forget to untie yourself first, or you'll be trapped on the slab when you get back in your own body!