The men of a small California town are dying off one by one, and they’re dying in the throes of SEX. The police just find a dead body with mouth agape in a motel room or out in the woods somewhere. In that same town is a big government scientific research facility so you know somebody in there is up to no good.
What they’re doing is turning all of the local ladies into half-woman/half-bee monsters. The women develop beady black eyes (that they hide behind sunglasses) and then go about seducing every man they see. And in bee-mating the male always dies.
Naturally, the process for turning a girl into a bee girl involves hypnotizing her into stripping completely naked and standing in the middle of a room where she gets shot with a special bee laser, and then all the other bee girls slowly rub every inch of her nude body with white goo that hardens into a bee cocoon. In the interest of science, the movie spends a lot of time on this scene.
The writer of this one is Nicholas Meyer, who’d go on to write or direct the only Star Trek movies of the 80s and 90s that were any good (though none of those had naked bee girls in them.)