What Aspasia was doing was the perfect example of preaching with visuals. After her encounter with Hal during what was supposed to be the night of consummating her marriage, Aspasia was of the mind that it was in the best interest of her mother to accept the call to Hal's side.
Aspasia had seen the light and was convinced that there was no victory without Hal. There was no hope of her clan ruling the Nexus world with Hal's plans in play and it would be better if the clan just surrendered to him.
With her mother as the target and most important to fall for the ushering in of this new era, there was a need to preach the goodness of Hal's cock. The sexual gospel had to be shown in all its glory and her visual message was being aided by the arousing scent that Hal just naturally gave off.