First read this as a loan from Galashiels Public Library in 1970s.
Basic plot: 2 humanoid aliens are stranded on Earth. The male becomes the subject of an investigation by a young female newspaper reporter. The female marries an engineer in the Space Program. She uses sex to extract information from him, as she is desperate to return home. I won't spoil the ending.
I think it was a yellow jacket cover, but I might well be wrong.