And, human sexuality being nature could be argued to be as a result of sexual reproduction being how the species perpetuates itself. And, there's hormonal systems that affect the brain in that regard, too.
Unless AIs were somehow programmed to have sexual reproduction amongst themselves, evolved it themselves, or were programmed to have a sex drive to fit in with humanity, there'd be no use for them to have a sex drive as part of their nature. Of course, asexual humans exist despite the hormonal and societal pressures to be sexual, and I'm wondering how an AI would even have a sex drive without somehow being programmed to be sexual.