This was artist/illustrator Wayne Barlowe’s first self-generated book first published in 1979. You can find out more about him and his other work here.
Covers from sci-fi erotic books that were published primarily in the 1960’s. Click on the link to see more at Earl Kemp’s E-Fanzine.
These are all mostly human/alien encounters but there are some amusing and strange moments. Especially from the clip where a tentacle grows out of a nipple!
from the New York Times by Ray Jayawardhana, author of “Strange New Worlds: The Search for Alien Planets and Life Beyond Our Solar System”
How To Create A Scientifically Plausible Alien Life Form by Charlie Jane Anders and Gordon Jackson