I have a college degree in biology and never heard of generative development.  Must be something some psychologist conjured up.  Means/ends of sex is clear without philosophy; it doesn't go there.  But I understand the desire to make it more than that on the basis of how good it feels.  It feels good because we're designed to reproduce and perpetuate the species.  STDs and newly resistant strains thereof, as well as incurable viruses are a strong motivation to drive our culture back to sexual conservatism, though admittedly it hasn't helped much with the male homosexual population.