Actually, most of the eligible men were Bringloidi like Brenna, and probably happy to go at it with her. The clones, since they had little sexual interest and Beverly said they were basically walking dead due to 15 generations of genetic drift, were best used strictly for training the Bringloidi and their offspring to use computers and replicators instead of spinning wheels and potheen stills.
DANILO: Well, you put a young couple together and you let nature take its course.
PULASKI: Now if this is going to work, you're going to have to alter your society, too. Monogamous marriage will not be possible for several generations.
DANILO: I don't quite understand.
PULASKI: Thirty couples are enough to create a viable genetic base. But the broader the base the healthier and the safer the society. So it will be best if each woman, Bringloidi and Mariposan, had at least three children by three different men.
DANILO: I think I could handle that, yes.
GRANGER: Oh, God, it's so
PICARD: Frightening?
GRANGER: Repugnant.
DANILO: So, it's a done deal? And here's my hand on it. (complete with spit) Right, now, let's go and stake out my three women. Send in the clones.
PICARD: I must be out of my mind.
PULASKI: Starfleet will probably agree with you.
So the thurppling was Pulaski's idea. Maybe I don't hate her after all?
Although quite frankly if the clones don't want to bang, then they can splooge into a beaker, and the women can shop around for what they want at a semen store. Making diverse babies in the lab has to be a lot easier than forcing orgies on people who are unprepared for group sex or the 24th century.