User blog comment:Laconia/The Lady's Romance Rant/@comment-3313822-20110518165138/@comment-23935799-20110518192803

Canonically speaking, the platinum thyroid implant only had a potential side effect of reducing a Spartan-II's sexual drive, so it's a may-or-may not situation. Also, Ajax-013's points stand as valid. As for the Spartan-IIIs, there is nothing stated in Ghosts of Onyx or any other material that indicates they were administered anything related to their sex drives. The incredible amount of discipline Spartans had would probably keep them in check, though affection would not be inhibited. It's really a subject that the novels and games have not made clear, with the exception of Black-One and Black-Three's relationship.