An adorable orange tabby named Hancock. You dont see him die but the little girl who loved him discovers his mutilated corpse, it was awful. Around the middle of the movie she goes off into the field/woods by herself - skip the next 10 minutes or so.
Not sexual per se, but the 6yr old girl "has her period" and is impregnated via aliens. Theres also a lot of sexually explicit conversation as someone is confronted about a relationship