I was just reading my quick post below about It Came From Outer Space, and realized I had a scene from this film in mind when I mentioned bad girl blonds... I don't think there was a platinum-haired young lady with "DOOMED" stamped on her forehead (to pay for her lusty thoughts, one presumes) in that film.
Instead, she appeared (briefly) in Teenagers From Outer Space, which was a fantastically entertaining 1950s "aliens from space" film we all enjoyed not long ago. (Yeah, we're on a bit of a '50s sci-fi kick here, but that happens!)
You'll understand my confusing the two movies, as both have a similar theme running through them that was rather atypical of the time: these aliens didn't choose our fair planet for conquering or blowing up, but rather as a temporary home for different purposes: in essence, for doing a little work under the hood in the former, and for growing food in the latter. Ok, more specifically, in Teenagers, they need to find an environment suitable for breeding the giant creatures on which they feed their human-like populace. The creatures are called Gargons, which coincidentally resemble very, very large lobsters, and make one's mouth water for a good portion of the film.
Teenagers is hilarious in many ways, and one of the most confounding quirks is that the actors portraying the "teens" look to be about 30 years old. Our hero, Derek, is the handsome young man -- er, teen -- alien who changes his mind about the whole plan, realizing it imperils Earth humans, and he's developed a bit of a crush on one of them, the perky Betty.
But other aliens don't share his view, and out come the laser guns, which can reduce a living, breathing body to a pile of bones (maybe this is more of a PG outing for younger viewers). There’s a fair amount of action, a moral message that ... um... not all teenagers are bad, and it’s just a whole lot of laughs.