The whole idea of Ilia with her pheromones and her ability to ensnare men with her sexuality in a teenage boy's dream. You can't probably get more sexist than this particular fantasy of GR's
IMO its only Kambatta's sweet-portrayal of llia that counteracts Ilia's sex goddess role.
IMHO, Deltans represent the swinging 60s free-love mindset. However, while that may have worked on Delta IV, GR was smart enough to realize that it would be disruptive to bring that attitude aboard a Starship, which is why Deltans had to swear celibacy. Unfortunately he had a blind-spot about romance in the workplace when it came to his own life.