Although the subject of sexual preference with regard to humans is only mentioned briefly in Spider Monkeys; Behavior, Ecology and Evolution of the Genus Ateles ed. by Christina J. Campbell, it supports Chiquito's behavior. "The keeping of monkeys as pets among indigenus peoples is commonly observed. In the Amazonian city of Iquitos in lowland Peru, many locals believe that spider monkeys behave differently toward women than to men (D. Urdaneta, personal communication)."
Chiquito has showed me his teeth three times - once when I wouldn't let him take the empty plastic syringe after giving him medication orally in applesauce, and twice when I wouldn't let him pull the nipple off a baby bottle with his teeth - but fortunately there was chainlink between us each time. I need to reprogram myself to distract him or offer a desirable substitute.