What are some common slang words in the 1970s for hot?

Depends on what you mean by hot. I hate to tell you but in the 1970s? Hot would actually mean stolen. It wouldnt mean anything at all that Paris Hilton would understand. Then again, there's a teensy tinsy possible probability that it could be applied in both ways to cars, ie: if you had a hot hot car, you could have an impressive car that was just stolen. But nobody would really use it that way.

The one term, though, that stands out in my mind for what I think you really do want is foxy. I know it sounds parodic, but it wasn't in the early 70s. That really is the Word that people would use, cf the late Cyrinda Foxe, cf the Sweet song Fox on the Run.

In fact, for all your foxy needs, you might look to the most popular songs of the time. That's where you'll get your slang terms, just like now.

But there weren't as many Words, I don't think, for this concept then. People really did use the Word sexy a lot--as in Rod Stewart's D'Ya Think I'm Sexy [of all horrible things]. They also used the Word fine.