Spoiler...i guess

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I'm not that sure if he wouldn't have done something simelar without his trauma.
When a Miller falls in love, they prefere meds over random partners ( Ashley for 10 years, Graysons started doing it too, although he already was kind of Steward's test object on his free will sometimes, and Dominic went on a darker path so can't be counted here).
And Chase already hates the idea of sex because of instincs/pheromones, without emotions.
If they don't release pheromones the natural way, they'll go to Steward for help. Or their father will make sure of that, because of his damaged brain (can't feel emotions any longer aside for his partner). Even if Chase hates his parents and has no contact with them for years, he is monitored by Ashley secretaries, all of his children are.