&gt; All you seem to have here is that animals touch eachother&#x27;s genitals sometimes. Not sure how that has any evolutionary implications.<p>Dogs regularly lick genitals of other dogs. Do you really think they didn&#x27;t evolve to do exactly that, that it&#x27;s &quot;unnatural&quot;?<p>Edit: Licking genitals as behavior is actually something that provably evolved, not less than anything else that any animal does. That&#x27;s how evolution works. jklinger410, I warmly suggest reading some books about evolution.