A story in the Karinaverse (Traveller) Universe
From the Karinaverse, involving a young Japanese woman named Opalaa (family name) Mijii (given name) who is a protege of Karina's in the Scout Service. It's based on an incident I read long ago that was purportedly true ~ maybe in a Hustler ~ about a man so aroused by a beautiful woman he met on a nude beach that he came just from looking at her, without even touching her or his penis. One imagines that the girl was flattered.
After a mishap during the testing of a new drug designed to help women have an orgasm, Maria has become terribly nymphomaniacal - she can't get enough sex! Doomed to stay in the lab for her (and humanity's) sake, she is lonely and very sexually deprived. Until Adam, a new lab tech comes along...
As far as he knew, Joe Granger was the only Terran being within lightyears, and he liked it that way. But one day at the market on Roku V, he saw something unexpected: another human. Stranger still, she was naked.
Progenitor A man is brought back from the dead by aliens, in order to spread the next stage of human evolution. In this section, the Progenitor appears on earth and seduces a girl from the beach.