A family boating on vacation near a Virginia barrier island on the 4th of July are the victims of an unusual biological attack, with very deviant consequences. The last third of the story is resolution; all the sex is in the first two thirds. The coercion is biological, and reluctance or regret is brief.
The main character is Albert and how he achieves his sexual fantasies. Especially with his mother, sister, stepmother, and stepsister. To accomplish this, he gets mixed up with a crooked sexual therapist and his sidekick. They exploit women and girls for their own satisfaction and profit.
Penniless minor Greek royal, Ari, at 17, has been with and bedded by Lord Reggie for 3 years and sails off with him in "caught doing young teens" exile from England to Casablanca, a major gay male retreat in the 1920s. Reggie abandons Ari in Casablanca, but being a handsome, blond, submissive, European teen in a gay male playground makes what Ari turns to to survive a fairly obvious proposition. He just has to be careful of Moroccan sheikhs who like to kidnap boys like Ari.
This never would have happened if Amber had taken the Burger King job! The teenager goes to work in a proctologist's office, as a test subject. What does all this have to do with sperm? Plenty! "And what happens if I do this...?" seems to be the extent of Dr. Fuller's methodology, as she tests Amber's snug ass with an amusing variety of exploratory tools (including her wiggling index finger). But Amber is one sharp tack! It doesn't take her long to figure out what's really going on.