Not yet

“Now, I see we’re almost out of time, but there’s one last thing I want to cover. Futanari and femboys have higher sex drives, likely because both X and Y genes have their own impacts on the body, and they have both. In femboys this is multiplied further. They have X genes but they don’t have female reproductive parts. Even so they still have the same urges, just without a great way to satisfy them like futanari do with their pussies. This is likely the reason femboys are so sensitive all the time, they can’t relieve the feminine urges as easily.”

Casey could definitely feel the sensations despite the lack of stimulation. He had been still struggling on edge ever since Miss Jackson’s handjob earlier.

“This also has some other consequences. Being so sensitive means they’re always ready to cum. In other words their cum production is quite high compared to futanari and men, despite having a much shorter ejaculation time and higher refractory period. From an evolutionary standpoint this phenotype of humans is interesting. YY men specialize in long penises and being effective at impregnating a small number of females. XX women specialize in the respective female aspects of childbirth and childcare. XY futanari benefit from a bit of both worlds so they can spread their genes in two different ways, but it comes at some drawbacks, like difficulty lactating for example. XY femboys on the other hand seem to have evolved specifically to generate a lot of cum to impregnate a lot of females at the cost of being an ‘ideal partner’. Many mammals pair and mate for life, meaning ‘femboy animals’ couldn’t possibly survive, but it’s different in humans. Because sex is a recreational/social activity beyond reproduction in humans, scientists think early femboy humans would seek females that had recent partners or are looking for an ideal partner and cum in them. Female humans can typically control when they get pregnant so they’re receptive to most sex because they can choose which sex partners lead to a child. However the sheer volume of cum from femboys typically overpowers other recent partners, and can last a long time, meaning even if they choose a new partner, the remaining femboy semen likely fertilizes her egg first.”

None of that went into Casey’s head, as he was still struggling on the edge of orgasm. (And I’m sure the reader too because they’re too busy gooning to femboy erotica). Miss Jackson pats his inner thigh to calm him down which definitely didn’t help.

“Now though we live in a modern society that pairs up for love and not ‘ideal mate’ which has allowed femboys to partner up happily with all other sexes, letting the femboy phenotype persist in humans.”

Miss Jackson is interrupted as the bell rings, signaling the end of the lass class for the day.

“Oh, that’s the end of class! As homework please review the next chapter in the textbook! We went over a lot of genetics today and I know some of you need to review that again. If anyone has any questions or wants to see our model up close, please stay behind! Have a good day to everyone else!”

Most people got up and put their things away to leave, though unfortunately for Casey many others stuck around to ask questions and look at his pathetic dick. He could see some people from other classes peering in from the doorway as they passed by to leave school.