Thanks Jo!!! I think this is reflective of the recent change in ToS though, which now clearly allows sex for plot purposes in novels. lemme dig it up...
"Depiction of genitals or sex acts including penetration is permitted for novels, as long as its primary narrative purpose is something other than erotic satisfaction. Creators with mature content must rate their content as Mature, to warn readers they may be encountering sensitive content. "
YEEE PLOT RELEVANT SEX!!!