Privates-el slice o roni.Cut em off.If its a big set you can have them freeze dried and hang from rear view mirror.

As for the rectum,cut a circle all the way around it deep as your knife will go and pull it through into stomach cavity with the guts and then out to ground.If this is your first buck ever killed,check your hunting regulations,you may be required to give the anus a smooch before gutting deer.....